Question

When $0.5$ mole of $NaOH$ were added to one littre of a buffer solution, its $pH$ changes from $5.70$ to $5.85$. Find the buffer capacity (nearest integer).

Answer 1

Buffer capacity is given by the expression:

$\text{Buffer capacity}=\frac{\text{Number of moles of acid/base added per litre of buffer solution}}{\text{change in pH}}$.

Substitute values in the above equation.

$\text{Buffer capacity}=\frac{0.5}{5.85-5.70}$

$=3.333$

$\approx 3$