A weak acid HX has the dissociation constant 1 × 1 0 - 5 M. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is

Question

A weak acid HX has the dissociation constant 1 × 1 0 - 5 M. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is, 0.0001%, 0.15 %, 0.01 %, 0.1 %

MARKS App · Accepted Answer

Hydrolysis reaction is X - + H 2 O → H X + O H - For a salt of weak acid with a strong base K h = K w K a = c α 2 = 1 0 - 14 1 0 - 5 = 0.1 × α 2 α 2 = 1 0 - 8 α = 1 0 - 4 so, the degree of hydrolysis = 1 0 - 4 × 100 = 1 0 - 2 = 0.01 %

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