Question

9.2 What happens to a phenolphthalein solution when
(a) it is added to a solution of hydrochloric acid?
(b) it is added to soapsolution? ​

Answer 1

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=> In alkaline solution, phenolphthalein gives pink color as it works as an indicator which shows its endpoint when it reacts with hydroxide ions of the base. It is a commonly used indicator in acid-base titrations. In acidic solution when acid is added, phenolphthalein gives a colorless solution.