Question

When CH₃COOCH₃ + HCl is titratedwith NaOH then at neutral point the colour of phenolphthalein becomes colourless from pink due to

(a) formation of CH₃OH

(b) formation of CH₃COOH which acts as a weak acid

(c) phenolphthalein vaporizes

(d) presence of HCl

Answer 1

Correct option  (b) formation of CH₃COOH which acts as a weak acid

Explanation:

NaOH solution is taken in a conical flask with phenolphthalein indioator (pink colour) and CH₃COOCH₃ + HCl solution is added from burette slowly.

First, HCI left after hydrolysis of ester (being a strong acid) gets consumed then CH₃COOH being a weak acid will bring the titration to the neutralisation point.