Question

On adding 20 mL of 0.1 N $NaOH$ solution to 10 mL of 0.1 N $HCl$, the resulting solution will:

• A. turn blue litmus red
• B. turn phenolphthalein solution pink
• C. turn methyl orange red
• D. will have no effect on red or blue litmus paper

Answer 1

Answer: (B)

turn phenolphthalein solution pink

As the volume of sodium hydroxide added to $HCl$ is two times more than the volume of acid, the solution is basic in nature which is confirmed by the indicator phenolphthalein. It turns to pink colour when added to an alkaline solution.