Question

A salt of strong acid and weak base is dissolved I water. Its hydrolysis in solution is?

• A. Unaffected on heating
• B. Increased by adding strong acid
• C. Suppressed by diluting
• D. Suppressed by adding strong acid

Answer 1

The correct option is A Unaffected on heating

A salt of strong acid and weak base is dissolved in water. It's hydrolysis in solution is supressed by adding strong acid.

Reason weak base

$M^{+}+H_{2}O\to MOH+H^{+}$

weak acid

$A^{-}+H_{2}O\to HA+{OH}^{-}$

the process of hydrolysis is actually the reverse of neutralisation

salt + water $\rightleftharpoons$ Acid + Base.

now, as the acid is stronger and is also in the products side, addition of strong acid shifts the reaction to left side and thus, supressing the hydrolysis.