Question

Discuss the action of phenolphthalein as an acid-base indicator

Answer 1

Answer:

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and red 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.

Answer 2

Answer: Phenolphthalein is a basic indicator. When it reacts with a base it turns pink while when it reacts with an acid it turns colourless.