Equal volumes of 0 . 5 N acetic acid and 0 . 5 N sodium acetate are mixed. What is the pH of resultant solution? ( pK a of acetic acid = 4 . 75 )

Step-by-step solution

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. pH = pK a + log sodium   acetate acetic   acid Given that Sodium   acetate = acetic   acid Hence, pH = pK a = 4 . 75