A buffer solution is to be made by using conjugate acid-base pair. Which of the following pair will be most suitable for preparing a buffer solution having $pH = 7.1$ ? (given: $lo g 2 = 0.3$ )
Acid Conjugate base Kₐ

Question

A buffer solution is to be made by using conjugate acid-base pair. Which of the following pair will be most suitable for preparing a buffer solution having $pH = 7.1$ ? (given: $lo g 2 = 0.3$ )

Acid Conjugate base Kₐ

TestHub · Accepted Answer

For preparing a buffer solution of a given pH, we prefer to choose an acid/base having a pKₐ/pK_b value as close as the pH value.

These are all acidic buffers, so pH is given by $p H = p K_{a} + lo g \frac{[ S a lt ]}{[ A c i d ]}$

In (d), $p K_{a} = - lo g K_{a} = - lo g (8 \times 1 0^{- 8}) = 8 - 3 lo g 2 = 8 - 0.9 = 7.1$ .

Chemistry - Ionic Equilibrium Question with Solution | TestHub

Options:

Doubts & Discussion