Equal volumes of 0 . 5   N acetic acid and 0 . 5   N sodium acetate are mixed. What is the…

The mixture of the acetic acid and sodium acetate acts as an acidic buffer. The pH of the solution can be calculated using Hendersen equation as shown below.

$\mathrm{pH}={\mathrm{pK}}_{\mathrm{a}}+\log \frac{\left[\mathrm{sodium} \mathrm{acetate}\right]}{\left[\mathrm{acetic} \mathrm{acid}\right]}$

Given that $\left[\mathrm{Sodium} \mathrm{acetate}\right]=\left[\mathrm{acetic} \mathrm{acid}\right]$

Hence, $\mathrm{pH}={\mathrm{pK}}_{\mathrm{a}}=4.75$