Ncert Exercises & Solutions

The mixture that will produce a buffer solution when mixed in equal volumes is:

Hint: Weak base and its salt with strong acid forms buffer when both are present together in solution

Explanation:

Step 1:

When the concentration of

{NH}_{4} OH

(a weak base) is higher than the strong acid (HCl), a mixture of a weak base

and its conjugate acid is obtained, which acts as a basic buffer.

Step 2:

The reaction is as follows:

\underset{After}{\underset{Initially}{_{}}}

reaction

\underset{0.1}{{NH}_{4} OH}

M 0.05

M + \underset{0}{\underset{0.05 M}{HCl}} \to \underset{0.05}{\underset{0}{{NH}_{4} Cl}}

M + H_{2} O

In the solution, the weak base and its conjugate acid are left. It is an example of a buffer. Hence, option third is the correct answer.