Question

A drop of phenolphthalein is added to a colourless solution and the colour of the solution remains unchanged so the given solution is

Answer 1

Since the solution remains colourless the solution is an acid.

Thank you I hope that this answer helps you

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