Question

Which of the following mixtures will act as a buffer solution when dissolved in 50 mL of water ?

• A. 0.2 mol of aniline + 0.2 mol of HCl
• B. 0.2 mol of aniline + 0.4 mol of NaOH
• C. 0.2 mol of NaCl + 0.1 mol of HCl
• D. 0.2 mol of aniline + 0.1 mol of HCl

Answer 1

Answer: (D)

0.2 mol of aniline + 0.1 mol of HCl

Answer 2

Aniline and its salt with $HCl$ will act as a buffer solution $0.2\,mol$ of aniline $+ 0.1 \,mol$ of $HCl$ $=0.1$ mol of aniline hydrochloride $+ 0.1$ mol aniline