Question

Which will make basic buffer solution?

• A. $50mL\text{of}0.1MNaOH+25mL\text{of}0.1MC{H}_{3}COOH$
• B. $100mL\text{of}0.1MC{H}_{3}COOH+100mL\text{of}0.1MNaOH$
• C. $100mL\text{of}0.1MHCl+200mL\text{of}0.1MN{H}_{4}OH$
• D. $100mL\text{of}0.1MHCl+100mL\text{of}0.1MNaOH$

Answer 1

The correct option is C $100mL\text{of}0.1MHCl+200mL\text{of}0.1MN{H}_{4}OH$

Buffer solution is the mixture of a weak acid and its conjugate base, or vice versa.
1.

This is basic solution due to $NaOH$. This is not basic buffer.

2.

Hydrolysis of salt takes place. This is not buffer.

3.

This is basic buffer solution. It is a mixture of weak base and its conjugate acid at the end of reaction.

4.

This is a neutral solution.

Hence, option (c) is correct.