Question

Buffering action of a mixture of ${CH}_{3}COOH$ and ${CH}_{3}COONa$ is maximum when the ratio of salt to acid is equal to:

• A. $1.0$
• B. $100.0$
• C. $10.0$
• D. $0.1$

Answer 1

The correct option is A $1.0$

Applying Henderson's equation,

Buffering action is maximum when $pH=p{K}_a+1orp{K}_a-1$

$pH=\log \frac{\left[Salt\right]}{\left[Acid\right]}-\log K_a$

So buffering action is maximum when the ratio of salt to acid is equal to 1.