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0.5 M ammonium benzoate is hydrolysed to...

`0.5 M` ammonium benzoate is hydrolysed to `0.25` precent, hence its hydrolysis constant is

A

`2.5 xx 10^(-5)`

B

`1.5 xx 10^(-4)`

C

`3.125 xx 10^(-6)`

D

`6.25 xx 10^(-14)`

Text Solution

Verified by Experts

The correct Answer is:
C
`{:(C_(6)H_(5)COONH_(4),rarr,C_(6)H_(5)COO^(-),+,NH_(2)^(+)),(0.5 - (.25)/(100),,(.25)/(100),,(.25)/(100)):}`
According to Ostwald dilution law.
`K = (alpha^(2)C)/(1-alpha) " " ( :. alpha = (.25)/(100))`
`K = alpha^(2)C " " ( because 1- alpha = "Very small")`
`K = (0.25)/(100) xx (0.25)/(100) xx 0.5 , K = 3.125 xx 10^(-6)`
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