For preparing a buffer solution of $\mathrm{pH} 6$ by mixing sodium acetate and acetic acid, the ratio of…
For preparing a buffer solution of $\mathrm{pH} 6$ by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be $\left(\mathrm{K}_{\mathrm{a}}=10^{-5}ight)$
$1: 10$
$10: 1$
$100: 1$
$1: 100$
Solution
$6=-\log 10^{-5}+\log \frac{\text { salt }}{\text { acid }}=5+\log \frac{\text { salt }}{\text { acid }}$
$\log \frac{\text { salt }}{\text { acid }}$ must be 1. $\therefore \frac{\text { salt }}{\text { acid }}=\frac{10}{1}$ or $10: 1$
.