Question

What is the reaction when we put phenolphthalein solution acetic acid? ​

Answer 1

Explanation:

Phenolphthalein is itself a weak acid. So when enough sodium hydroxide has been added to the acetic acid, such that there is no longer any unreacted acetic acid, the sodium hydroxide will then begin reacting with phenolphthalein. The reaction of phenolphthalein with sodium hydroxide results in a pink solution.