Question

A few drops of phenolphthalein indicator was added to an unknown solution A. It acquired pink color.

Answer 1

Then the substance is a base

Answer 2

A few drops of phenolphthalein indicators were added to an unknown solution A. It acquires pink colour. Now another unknown solution B was added to it drop-by-drop & the solution becomes colorless. Predict the nature of A & B.

1. Sol. A = Basic / Alkaline
2. Sol. B = Acidic / Neutral