Question

Assertion :pH of amphirprotic anion is independent of concentration. Reason: pH of amphiprotic anion is given by $\frac{1}{2}[p{K}_1+p{K}_2]$ where as $K_1$ and $K_2$ are the dissociation.
constants of the acid from which amphiprotic anion is formed.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

An amphirprotic anion can either donate or accept a proton.
For these anions, $\left[H^{+}\right]=\sqrt{K_1{K}_2}$.
Hence, $pH=\frac{1}{2}[p{K}_1+p{K}_2]$.