WebJul 20, 2024 · Phenolphthalein, whose structure is shown below, is a colorless weak acid (K a = 3 × 10 –10 mol/L). Its conjugate base, C 20 H 13 O 4 – has a strong pinkish-red color. … WebJan 13, 2024 · Phenolphthalein, an acid-base indicator used to test the pH of a solution, turns pink due to the presence of a weak base. The indicator itself is a weak, colorless acid that forms pink anions when it dissolves in water. Although the anions are pink, the solution remains colorless in the presence of an acid. ...

Phenolphthalein Magnificent molecules RSC Education

WebPhenolphthalein's production and use as an acid/base indicator, as a laboratory reagent, and its former use as a laxative may result in its release to the environment through … seats truck seats

14.9: Indicators - Chemistry LibreTexts

WebPhenolphthalein ( / fɛˈnɒl ( f) θəliːn / [citation needed] feh-NOL (F)-thə-leen) is a chemical compound with the formula C 20 H 14 O 4 and is often written as " HIn ", " HPh ", " phph " or simply " Ph " in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless ... WebFeb 10, 2024 · It is a colorless, weak acid that is widely used in titration experiments to indicate the titration endpoint. The formation of pink color indicates the endpoint. The phenolphthalein indicator turns light pink under normal alkaline conditions and colorless under acidic and extremely alkaline conditions. History and Synthesis of Phenolphthalein WebPhenolphthalein is a colourless, weak acid which dissociates in water forming pink anions. Under acidic conditions, the equilibrium is to the left,and the concentration of the anions is too low for the pink colour to be observed. However, under alkaline conditions, the equilibrium is to the right, and the concentration of the anion becomes ... seat stuffers