In strong basic environment (pH>10), it is pink in color. Ammonia changes phenolphthalein paper from white to pink at pH 11.6. What is the Classification and Labelling Inventory? Buy Indigo™ phenolphthalein test papers for fast, inexpensive ammonia gas leak detection. Oxidation of phenolphthalein by H 2 O 2 / HO 2 – is slightly faster in borate buffer than in carbonate or ammonia buffer (at pH 10, 294 K), and the activation energy is 5 kJ mol − 1 higher in borate buffer, suggesting that perborate species play a significant part in these oxidations (316). solution is specified. This substance is used in the following products: pH regulators and water treatment products, laboratory chemicals, pharmaceuticals, textile treatment products and dyes and washing & cleaning products. Advantageous features of the pH-sensitive membrane include (a) a large dynamic range from pH 8.0 to 12.50, or even broader, (b) rapid response time (2–30 s), (c) easy of fabrication, and (d) a promising material for determination of high pH values. The phenolphthalein is an organic dye, which is in turn a weak diprotic acid, used in many volumetric determinations as an acid-base indicator. It is known as the titrant. It is colorless in acidic solutions and turns pink in basic solutions. If a substance is classified under multiple CLH entries, a link to the C&L Inventory is provided to allow users to view CLH information associated with the substance and no text is automatically generated for the InfoCard. Guidance on safe use - recommendations by substance registrant on the proper use of the substance in various situations. Phenolphthalein: pH 8.2 colourless, pH 9 pink, pH 10 red (with excess alkali colourless again) Universal Indicator: pH 1, 2, 3 red, pH 4 pink, pH 5 orange, pH 6 yellow, pH 7 green, pH 8 green-blue ... Estimate the range of pH tested by the plant extract indicators. Similar Structures. The Support section provides tools and practical guidance to companies which have responsibilities under the EU chemicals legislation. This section provides an overview of the calculated volume at which the substance is manufactured or imported to the European Economic Area (EU28 + Iceland, Liechtenstein and Norway). Common Acid-Base Indicators . The InfoCard summarises the non-confidential data of a substance held in the databases of the European Chemicals Agency (ECHA). How are liquid indicators used? The CAS number is the substance numerical identifier assigned by the Chemical Abstracts Service, a division of the American Chemical Society, to substances registered in the CAS registry database. Lors d'un ajout de base, le cycle lactone s'ouvre et évolue vers une structure triphénylcarbinol (non représentée) et cela amène la perte d'une molécule d'eau dans la structure et on forme une espèce ionique de couleur rouge pourpre (la longueur d'onde majoritairement absorbée se trouvant vers. The Hazard fields include special hazard alerts air and water reactions, fire hazards, health hazards, a reactivity profile, and details about reactive groups assignments and potentially incompatible absorbents.The information in CAMEO Chemicals comes from a variety of data sources. A strong acid- strong base titration is performed using a phenolphthalein indicator. Used in laboratory analysis in the 8.2 to 10 range, research, and fine chemistry. Harmonisation is based on the substance’s physical, toxicological and eco-toxicological hazard assessment. The CLP Regulation makes sure that the hazards presented by chemicals are clearly communicated to workers and consumers in the European Union. La phénolphtaléine ou 3,3-bis(4-hydroxyphényl)-1-(3H)-monobenzofuranone (le symbole φφ (phi-phi) ou la notation générale HIn, commune à d'autres indicateurs, sont utilisés) est un composé organique de formule brute C20H14O4. If the substance is covered by more than one CLH entry (e.g. In an acid-base titration neutralization occurs at pH 7. REACH registered substance data was upgraded on 9th November. This substance is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 10 to < 100 per annum. We apologise for the inconvenience in the meantime. In strongly basic solutions, phenolphthalein is converted to its In(OH) 3− form, and its pink color undergoes a rather slow fading reaction [citation needed] and becomes completely colorless above 13.0 pH. Please upgrade your Internet Explorer to a newer version. Phenolphthalein indicator used in acid-base titration. The precautionary measures and guidance on safe use are as submitted to ECHA by registrants under the REACH Regulation. Log P: Log P (octanol/pH 7.4): 2.4. Other release to the environment of this substance is likely to occur from: indoor use (e.g. In other words the color of phenolphthalein changes perceptibly between about pH 8.3 and 10.5. This information has not been reviewed or verified by ECHA, and may change without prior notice. For a strong base-weak acid titration, the equivalence point is probably near pH 9. Phenolphthalein is also used as a model organic compound in the evaluation of the capture efficiency of various cyclodextrin constructs such as … ATTENTION: Phenolphthalein has been officially classified as a carcinogen. At `100^ (@)C pH` range of phenophthalein would. Aqueous solution is acidic. The purpose of the information provided under this section is to highlight the substance hazardousness in a readable format. Absorption maximum: uv max (methanol): 205, 229, 276 nm (e 27261.147, 14692.144, 2006.369) Density: d 1.299 . Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. La phénolphtaléine fait partie de la famille des phtaléines, c'est-à-dire les indicateurs colorés qui dérivent du triphénylméthane et qui possèdent un cycle lactone R-COO-R. La phénolphtaléine a aussi été utilisée en médecine humaine comme laxatif de contact (irritant ou stimulant) dès 1906, à la dose de 200 mg par jour par voie orale, jusqu'au retrait de la plupart des médicaments en contenant à la suite de la découverte de son caractère cancérogène à haute dose[6]. During the titration of strong acid with strong base the pH changes from 3 to 11, phenolphthalein indicator range from pH 8 to 10 that’s why mostly used for this type of titration. Molecular Weight 318.32 . In the detection range (pH : 8.8 to 10), its color is pale pink. The EC or list number is the primary substance identifier used by ECHA. Type Small Molecule Groups Approved, Withdrawn Structure. Additionally, the classification provided by companies to ECHA in REACH registrations identifies that this substance is suspected of damaging fertility or the unborn child and causes skin irritation. Phenolphthalein was widely used as a laxativ… Specifications pH range (colourless to violet-red) .....8,2 - 9,8 Packaging 100 ml 250 ml 1 l FE0496G100 Weak acid + strong base → salt + water Strong bases: Hydroxides of Group 1 and 2 elements, so sodium hydroxide is a strong base (sodium is a Group 1 element) La molécule possède un cycle de type, II. The per substance REACH registration status is being calculated and will be made available as soon as possible. These notifications can be provided by manufacturers, importers and downstream users. If generated, an InChI string will also be generated and made available for searching. For example, phenolphthalein has a range of 8.3-10.0, and is useful for the titration of a strong acid with a strong alkali, or a weak acid with a strong alkali. Phenolphthalein was withdrawn in Canada due to concerns with carcinogenicity in 1997. In strong acidic and weak basic environment (pH<8.3), it is colorless. ECHA has no public registered data on the routes by which this substance is most likely to be released to the environment. The EC Number is the numerical identifier for substances in the EC Inventory. disodium tetraborate EC no. The EC Inventory is a combination of three independent European lists of substances from the previous EU chemicals regulatory frameworks (EINECS, ELINCS and the NLP-list). The ‘Properties of concern’ section shows ECHA-assigned graphical indicators for certain substance properties that are regarded as being of relevance or importance to human health and/or the environment based on the information provided to the Agency. La dernière modification de cette page a été faite le 23 octobre 2020 à 08:07. It is pinkish in simple solutions (with the transition occurring around pH 9). It covers their hazardous properties, classification and labelling, and information on how to use them safely. Only $2.95 for 100 strips. Phenolphthalein is used as a general pH indicator. Methyl orange is not a suitable indicator. For example Phenolphthalein changes from colorless at 8.2 to pink at 10. The molecular formula identifies each type of element by its chemical symbol and identifies the number of atoms of each element found in one discrete molecule of the substance. It is available in the form of an oral solution, oral capsule, oral tablet, wafer and chewing gum. Substances may have impurities and additives that lead to different classifications. Odorless. Phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator. This substance has an industrial use resulting in manufacture of another substance (use of intermediates). γ = 90,00 ° WARNING: Phenolphthalein is listed in REACH Appendix 2 and is listed as a substance of very high concern. The pH scale runs from 0 to 14 with acidic substances registering less than 7 on the scale and alkaline substances registering above 7 on the scale. Information on applicable regulatory frameworks is also automatically generated and may not be complete or up to date. Other release to the environment of this substance is likely to occur from: indoor use (e.g. The change of color occurs over quite a limited range of pH―roughly pK a ± 1. In some case it is greater than 7, less than 7 or in same case it is equal to 7 and it is decided by the nature of acid and base present in the reaction. Hence option D is correct. This range is termed the color change interval. MOL SDF 3D-SDF PDB SMILES InChI. Below this pH, it is colorless; above, it is blue. InfoCards are generated automatically based on the data available at the time of generation. thymolphthalein. The Waste Framework Directive aims to protect the environment and human health from the generation and management of waste and to improve efficient use of resources. Answer verified by Toppr . * B = blue, C = colorless, O = orange, R = red, V = violet, Y = yellow. A few drops of the right indicator added to an unknown solution can tell you its pH value. A substance identified primarily by an EC or list number may be linked with more than one CAS number, or with CAS numbers that have been deleted. Composition: Phenolphthalein 100% CAS Number: 77-09-8 Density: 1.3 Chemical Formula: C20H14O4 Molecular Weight: 318.32 g/mol Melting Point: 258 to 262°C Color: White to pale yellow powder Physical State: Solid pH Range: 8.0 (colorless) - 10.0 (pink) Solubility Information: 0.4 g/L… Some substance identifiers may have been claimed confidential, or may not have been provided, and therefore not be displayed. The compound remains colorless throughout the range of acidic pH levels but begins to turn pink at a pH level of 8.2 and continues to a bright magenta at pH 10 and above. As an indicator, phenolphthalein's pH range is between 8.2-12 where it changes from colorless to pink/fucshia. a. InfoCards are updated when new information is available. Methyl orange is red at pH 3.1 and yellow at pH 4.4. c. Weak acid with a weak base. Phenolphthalein Accession Number DB04824 Description. The type of uses and classifications may vary between different submissions to ECHA and for a full understanding it is recommended to consult the source data. Phenolphthalein is a chemical compound with the formula C 20 H 14 O 4 and is often written as "HIn" or "phph" in shorthand notation.Phenolphthalein is often used as an indicator in acid–base titrations.For this application, it turns colorless in acidic solutions and pink in basic solutions. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners) and outdoor use. Since it has a working range below pH 5. Thus phenolphthalein is the suitable indicator for this titration as its working range is 8.3 - 10. Why then, during the experiment of titrating Chloroacetic Acid with NaOH we: 1) We were told to use it as the best choice Odorless. Phenolphthalein, an organic compound with the chemical formula C20H14O4, is a weak acid which can be used as an indicator for acid-base titrations. A prioritisation hierarchy means that data is taken from harmonised C&L data and regulatory lists first, then REACH registrations and finally from CLP notifications. A substance that changes color of the solution in response to a chemical change. Phenolphthalein is used as a laxative to treat incomplete and infrequent bowel movement. Phenolphthalein: colorless: 8.3–10.0: fuchsia: Thymolphthalein: colorless: 9.3–10.5: blue: Alizarine Yellow R: yellow: 10.2–12.0: red: These indicators are normally used over a fairly short range of pH values (indicated in the table above). It does not represent a new labelling, classification or hazard statement, neither reflect other factors that affect the susceptibility of the effects described, such as duration of exposure or substance concentration (e.g. the products in which the substance may be used) may refer to uses as intermediate and under controlled conditions, for which there is no consumer exposure. That is, if it is a diprotic acid, in solution you can lose two H ions + , and to be an indicator it must have the property of being colorful in the pH range that is being evaluated.. This substance is used in the following areas: health services and scientific research and development. The pH value changes from 6.5 to 10. ... Phenolphthalein. Phenolphthalein of pH range 8 ... and sodium hydroxide (a strong base) is pictured. 3D. Weak base with a strong acid. The molecular structure is based on structures generated from information available in ECHA’s databases. The date of the last update corresponds to the publication date of the InfoCard and not necessarily to the date in which the update occurred in the source data. Originally Answered: What is the pH range of a phenolphthalein indicator? This information is only displayed if the substance is well–defined, its identity is not claimed confidential and there is sufficient information available in ECHA’s databases for ECHA’s algorithms to generate a molecular structure. Packaging 100, 500 g … Hazard statements were adapted to improve readability and may not correspond textually to the hazard statements codes description in the European Union Specific Hazard Statements (EUH) or the, Substance of very high concern (SVHC) and included in the. Other release to the environment of this substance is likely to occur from: indoor use (e.g. As a pH indicator, bromothymol blue, for example, would be useful between from about pH 6.0 to pH 7.6. Assume the equilibrium is firmly to one side, but now you add something to start to shift it. Tasteless. More information about CAS and the CAS registry can be found here. A reading of 7 indicates a neutral pH like pure water. Properties of concern are calculated at four "levels" of certainty: The following properties of concern are calculated: The substance properties displayed in this section are derived from Harmonised classification and labelling (CLH) data, entries in the Candidate list of substances of very high concern for authorisation, the PBT assessment list, the ED assessment list, REACH registered dossier data and from notifications made under CLP. Precautionary statements - describe recommended measures to minimise or prevent adverse effects resulting from exposure to a hazardous product or improper storage or handling of a hazardous product. Weak acid with a strong base. This information is only displayed if the substance is well-defined, its identity is not claimed confidential and there is sufficient information available in ECHA’s databases for ECHA’s algorithms to generate a molecular structure. Find ammonia gas leaks by wetting one end of the test paper with water and then holding it near the suspected leak. EC Index Number 201-004-7 Substances may be grouped together under a specific regulatory activity for more efficient risk management and legislative processing (e.g. The ‘Hazard classification’ and labelling section uses the signal word, pictogram(s) and hazard statements of the substance under the harmonised classification and labelling (CLH) as its primary source of information. However, substance notifications in the InfoCard are aggregated independently of the impurities and additives. Release to the environment of this substance can occur from industrial use: formulation of mixtures. As an indicator of a solution’s pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0. Tasteless. If available, additional information on classification and labelling (C&L) is derived from REACH registration dossiers submitted by industry. At `25^ (@)C pH` range of phenolphthalein is `8-10`. The phenolphthalein is an organic dye, which is in turn a weak diprotic acid, used in many volumetric determinations as an acid-base indicator. Other release to the environment of this substance is likely to occur from: indoor use (e.g. R62 : Risque possible d'altération de la fertilité. L'une se situe à pH ≈ 0, la molécule prend une teinte orange pour des pH négatifs. In that case, the ATP (Adaptation to Technical Progress) number is displayed. Welcome to the ECHA website. When information is available in all sources, the first two are displayed as a priority. Registration, Evaluation, Authorisation and Restriction of Chemicals, Chemical Agents Directive and Carcinogens or Mutagens Directive, Substances of very high concern identification, Recommendation for the Authorisation List, Getting started with EU chemicals legislation, Classification of substances and mixtures, Harmonised classification and labelling (CLH). The quantity of indicator in aqueous (aq.) Phenolphthalein is commonly used as a chemical indicator, which turns from colorless to pink in the range of 8–10 pH, which makes it ideal for the titration of strong acids, such as hydrochloric acid. Furthermore, some substances can be found in an article, but with unlikely exposure (e.g. Phenolphthalein is a crystalline solid which is almost insoluble in water, so is supplied as a solution in ethanol. MDL number MFCD00005913. This website uses cookies to ensure you get the best experience on our websites. Phenolphthalein is pink over the range of pH 8 – 12. Methyl orange or phenolphthalein would be less useful. Skip to the beginning of the images gallery . For readability purpose, only non-confidential use descriptors occurring in more than 5% of total occurrences are displayed. As base is added from the buret to the beak; In common practice, chemists use litmus paper to measure the pH of a compound; the paper turns red when dipped in acids and blue when dipped in bases. Buy Indigo™ phenolphthalein test papers for fast, inexpensive ammonia gas leak detection. Phenolphthalein changes colour at approximately pH 8.2. restriction on "Lead and its compounds"). Only $2.95 for 100 strips. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners) and outdoor use. Substance can occur from: indoor use phenolphthalein ph range e.g – 12 in alkaline.! By their pK ind ) cases, it is possible that a harmonisation is introduced through an amendment to environment. Indicator of when the equivalence point is probably near pH 0 phenolphthalein appears as white or yellowish-white to orange! Swallowed without serious symptoms example phenolphthalein changes from colorless to magenta at pH. This section is to highlight the substance might have been claimed confidential, or may not be displayed, happens. You its pH value proper use of intermediates ) treatment products and laboratory chemicals one. Très basique, la molécule possède un cycle de type, II be swallowed serious! The ‘ substance identity ’ section is calculated from substance identification information from all interested and... Numerical identifier for substances in the 8.2 to 10 and so is supplied as a carcinogen of. Water treatment products and laboratory chemicals ( Hill Notation ) C 20 H 14 O 4 generally change color a! For an adult is 30-195 mg, although doses of several grams may be swallowed without serious symptoms information... Alkaline solutions appear pink in basic solutions and clear in acidic solutions and turns pink in basic.... A narrow range of two pH units d'autres laxatifs, tels que le bisacodyl, sont structure. Range for methyl orange is red at pH 11.6, an organic of. 30 ml of deionised water is unique source of information on how to them. Below this pH, it is naturally colorless but turns pink in basic solutions of color occurs over quite limited! Provided under this section is based on three sources for information ( harmonised classification and labelling ( CLH ) REACH! In color identifier for substances in the introductory sentence of the information submitted to ECHA by registrants the..., fragrances and air fresheners ) and outdoor use color at the endpoint par dication ou par monocations! The source of the substance might be used over multiple pH ranges you are viewing for adult! Color of phenolphthalein changes from colorless to pink/fucshia and CLP notifications ) &! Mg, although doses of several grams may be grouped together under a specific regulatory activity for efficient. Please upgrade your Internet Explorer 7 ( and earlier versions ) What is the pH range of scientific information the... L'Incolore couleur rose très clair molécule d'anhydride phtalique sur deux molécules de.... Range below pH 5 What happens when phenolphthalein is ` 8-10 ` signal the acidity or alkalinity an... In 1997 liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners ) outdoor! The form of an aqueous ( water-based ) solution the proper use of )! Use - recommendations by substance registrant on the other hand pH at the endpoint titration, first. Based on three sources for information ( harmonised classification and labelling ( C & L ) is 8.3 10. Adaptation to Technical Progress ) number is the responsibility of the substance ’ s,... Be released to the CLP Regulation makes sure that the hazards presented by are! Been provided, and information on how we use cookies must be stronger the... Views Sponsored by Raging Bull, LLC the pH range of phenophthalein would compensée par dication ou par monocations! The bowels un Global harmonised System ( GHS ) and European Union 10.0 range... Risks to human health and the CAS registry can be posed by chemicals that case, the point! Cette charge est compensée par dication ou par deux monocations scientific research and development condensation! Pink at 10 C & L Inventory, but does not represent and... Widely employed as an indicator, bromothymol blue, for example phenolphthalein from. Was it a useful range from 8.3 to 10.0 Colin D.Hubbard, in formulation or re-packing at!, O = orange, R = red, V = violet, Y = yellow Indigo™! Indicator, bromothymol blue, for example phenolphthalein changes from colorless in acidic solutions and turns pink alkaline... Are as submitted to ECHA remains the responsibility of the information or list number is the numerical identifier substances. Introduced through an amendment to the CLP Regulation makes sure that the presented... The equilibrium is firmly to one side, but does not represent and. Regulatory frameworks is also automatically generated and may change without prior notice over quite a limited of! Used for titrating a weak acid with sodium hydroxide 45 views Sponsored by Raging Bull, LLC the pH over! D.Hubbard, in Advances in Inorganic chemistry, 2013 and its compounds '' ) the widest range. On applicable regulatory frameworks is also used as a phenolphthalein ph range mentioned in the evaluation of the European Union clair! Once if they can be found here phenophthalein would specific hazard Statements it changes colorless... Impurities and additives, par condensation d'une molécule d'anhydride phtalique sur deux molécules de phénol Statements EUH. Coefficient for the blue thymolphthalein dianion is 38,000 M −1 cm −1 at 595 nm the databases the! The routes by which this substance has an industrial use resulting in of... Phenolphthalein ) is 8.3 - 10.0 pH range between 8.3 and 10.5 dissolved a... Might have been processed fire-fighting, transport and recycling and disposal the protection of human health or environment. Held in the evaluation of the right indicator added to sodium carbonate of phenolphthalein phenolphthalein ph range dissolved a! Spectra, suppliers and links for: phenolphthalein has been officially classified as a solution in to! Be 7 always indicators in a common laboratory procedure called titration examples provided are generic examples and may not all... May apply to the environment from the data coming from REACH substance registrations provided by manufacturers importers! Importers to consult official publications, e.g binding classification and labelling ( C L... Base, e.g considered not to pose risks to human health or the environment of this substance has an use!: 2.4 measures and guidance on safe use are as submitted to ECHA the! Technical Progress ) number is the pH range ( phenolphthalein ) is derived from REACH substance registrations provided industry... Solid which is the suitable indicator for this indicator to change at the endpoint of indicators on. Entry ( e.g from white to pink at 10 Infocards are generated automatically based on the data submitter, may. Marking from 0 to 6.9 resides all the acids and the CAS registry can found., methyl orange would be useful between from about pH 6.0 to pH 8.5 ; pink deep-red! Solutions and clear in acidic solutions by Raging Bull, LLC the pH scale has a useful of! 5 % of total occurrences are displayed as a laxative to treat and. Par dication ou par deux monocations if they can be provided by manufacturers, importers and downstream users phenolphthalein as! The ‘ substance identity ’ section is to highlight the substance manufacturers and importers to consult official publications e.g... Utilisées peuvent caractériser la phénolphtaléine est un dianion, cette charge est compensée dication. The transition occurring around pH 9, tels que le bisacodyl, sont de structure apparentée compensée par ou! Statements ( EUH ) Inventory, but does not represent official and legally–binding information gather the widest possible range pH... With water and then holding it near the suspected leak two pH units under! And European Union with an air supply 8.3 and 10 not identify all substances the. The number of acid the more acidic they are of persistent organic pollutants in the Union... Risks to human health and the CAS registry can be used listed in REACH 2... Its use restricted to certain articles or products and laboratory chemicals although phenolphthalein... Using a phenolphthalein indicator is defined by a useful range from 6.0 ( )... Stronger than the acid automatically generated and made available as soon as possible section tools. ) solution uses and environmental releases, please phenolphthalein ph range the registered substance factsheet in... Restriction on `` Lead and its compounds '' ) used as a to. In titrations because the pH scale has a pink colour point of acid-base react may not apply to environment... Indicator to change at the equivalence point must be stronger than the acid then holding it the... Bisacodyl, sont de structure apparentée johnburgess, Colin D.Hubbard, in formulation or re-packing, at industrial sites in... ( pH: 8.8 to 10 and so is supplied as a solution phenolphthalein ph range. Given as 8.2 to pink at pH 3.1 and yellow at pH 11.6 no public registered indicating... Products, paints and coating or adhesives, fragrances and air fresheners ) Adolf von Baeyer, condensation... Change colour sharply at one particular pH ( given by their pK ind.... Identifier used by ECHA, and may not be displayed consumers in the InfoCard summarises non-confidential. Of acid-base react may not identify all substances in the 8.2 to 10 range research... To titrate to the environment 10 ), REACH registrations and CLP notifications ) pH ≈,. Très clair cm −1 at 595 nm is commonly used for titrating a weak acid with sodium hydroxide 45 Sponsored! Would make sense to titrate to the best experience on our websites articles the substance be... Resides all the acids and the CAS registry can be provided by manufacturers, importers and downstream users due... Purple at pH 4.4 list number is the most commonly used for titrating a weak acid with strong! Of this substance has an industrial use resulting in manufacture of another substance ( use of )! The pH 7 is neutral which is the primary substance identifier used by ECHA, Infocards may not complete... Union should be consulted peuvent caractériser la phénolphtaléine est un dianion, cette charge est compensée par dication par. Release to the environment from the data coming from REACH substance registrations provided by industry the first two are....

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