Solveeit Logo
Login

Question

Question: An acidic buffer is obtained on mixing:...

An acidic buffer is obtained on mixing:

A

100 mL of 0 .1 M CH3COOH and 100 mL of 0 .1 MNaOH

B

100 mL of 0 .1 M HCl and 200 mL of 0 .1 M NaCl

C

100 mL o f 0 .1 M C H 3 C O O H a n d 200 mL o f 0 .1 M N a O H

D

100 mL of 0 .1 M HCl and 200 mL of 0 .1 M CH3COONa

Answer

100 mL of 0 .1 MHCl and 200 mL of 0 .1 MCH 3 COONa

Explanation

Solution

An acidic buffer solution is a mixture of a weak acid and its salt with a strong base (conjugate base).

  1. 100 mL of 0.1 M CH₃COOH and 100 mL of 0.1 M NaOH: This is not a buffer; it will be basic due to hydrolysis of CH₃COO⁻.

  2. 100 mL of 0.1 M HCl and 200 mL of 0.1 M NaCl: This mixture is a strong acid solution with a spectator salt. It is not a buffer.

  3. 100 mL of 0.1 M CH₃COOH and 200 mL of 0.1 M NaOH: The resulting solution contains CH₃COONa and excess strong base (NaOH). This is not a buffer; it will be strongly basic.

  4. 100 mL of 0.1 M HCl and 200 mL of 0.1 M CH₃COONa: This mixture of a weak acid and its salt with a strong base constitutes an acidic buffer. HCl reacts with CH₃COONa to produce CH₃COOH and NaCl. The resulting solution contains a mixture of CH₃COOH and CH₃COONa, forming the buffer.