Question

Which of the following salts undergoes hydrolysis?

• A. $Na_{2}SO_{4}$
• B. $CH_{3}COOK$
• C. $KNO_{3}$
• D. NaBr

Answer 1

Answer: (B)

$Na_{2}SO_{4},NaBr$ and $KNO_{3}$ are the salts of strong acids and strong bases, so they do not undergo hydrolysis. $CH_{3}COOK$ is salt of weak acid, $CH_{3}COOH$ and strong base KOH, so it hydrolyses to give basic solution (i.e., $pH>7$ )
$CH_{3}COO^{-}K+HOH \rightarrow \underset{\left(\right. w e a k  a c i d \left.\right)}{C H_{3} C O O H}+\underset{\left(\right. s t r o n g  b a s e \left.\right)}{K O H}$