First slide

Salt hydrolysis :

Question

The aqueous solution of potash alum is acidic due to hydrolysis of

Easy

A

$K^{+}$
B

${Al}^{3 +}$
C

$S {O_{4}}^{- -}$
D

presence of acid in its crystal as impurity

Solution

${Al}^{3 +}$ having high charge density will associate strongly with water through its fractional negatively charged oxygen pole and in such interaction there will be hydrolysis to some extent :
${Al}^{3 +} + H_{2} O ⇌ {[Al (OH)]}^{2 +} + H^{+}$
The product cation may hydrolyze further.

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