Question

The pH of an acidic buffer mixture is

• A. 6.8
• B. 7
• C. 7.5
• D. depends upon $K_a$ of the acid

Answer 1

Answer: (D)

depends upon $K_a$ of the acid

Answer 2

The pH of acidic buffers is calculated by following formula $pH=-\log {{K}_{a}}+\log \left[ \frac{\text{salt}}{\text{acid}} \right]$ $\therefore$ pH of acidic buffer depends on value of ${{K}_{a}}$ and is always less than 7