Pharmaceutical Chemicals
Description
Phenolphthalein CAS 77-09-8 for Anthelmintic
Product Name: Phenolphthalein;
Synonyms: LABOTEST-BB LT02090809;CI 764;CI NO 764 (1924);BETZ 0212;3,3-BIS(4-HYDROXYPHENYL)-1(3H)-ISOBENZOFURANONE;3,3-Bis(4-hydroxyphenyl)phthalide;3,3-BIS(P-HYDROXYPHENYL)PHTHALIDE;TIMTEC-BB SBB008868;
CAS: 77-09-8;
MF: C20H14O4;
MW: 318.32;
EINECS: 201-004-7;
Product Categories: Furan&Benzofuran;Analytical Chemistry;Indicator (pH);pH Indicators;Chemistry;Indicator Solutions;Indicators;Titration;Indicator SolutionsStains and Dyes;P;Stains&Dyes, A to;API;
Melting point: 258-263 °C;
density: 1.299;
Fp: 24 °C;
Water Solubility: <0.1 g/100 mL;
HS Code: 29322910;
Chemical Properties: white to light yellow crystal powder;
Description:
Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as & quot;HIn& quot; or & quot;phph& quot; 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.
Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments. It is a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless, and the phenolphthalein ion is pink. When a base is added to the phenolphthalein, the molecule ? ions equilibrium shifts to the right, leading to more ionization as H+ ions are removed. This is predicted by Le Chatelier& acute;s principle.
Usage:
Phenolphthalein& acute;s common use is as an indicator in acid-base titrations. It also serves as a component of universal indicator, together with methyl red, bromothymol blue, and thymol blue.
Phenolphthalein adopts four different states in aqueous solution: Under very strongly acidic conditions, it exists in protonated form, providing an orange coloration. Between strongly acidic and slightly basic conditions, the lactone form is colorless.
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