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Question

The degree of hydrolysis of a salt of weak acid and a weak base in it's 0.1M solution is found to be 50%. If the molarity of the solution is 0.2M, the percentage hydrolysis of the salt should be:

A
100%
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B
50%
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C
25%
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D
none of these
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Solution

The correct option is D 50%
degree of hydrolysis of salt of weak acid and weak base is independent of concentration(molarity) of solution
Ex.
Suppose a weak acid and weak base salt CH3COONH4
CH3COOC(1h)+NH+4+H2OC(1h)CH3COOHCh+NH4OHCh
According to law of mass action
kh=C2h2C2(1h2)=h21h2 (Independent on C)
Hence B is correct option

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