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The dissociation constant of a substitue...

The dissociation constant of a substitued benzoic acid at `25^(@)C` is `1.0 xx 10^(-1)`. Find the `pH` of a `0.01M` solution of its sodium salt.

Text Solution

Verified by Experts

For a salt of weal acid and strong base,
`pH = 7+(1)/(2)pK_(a) +(1)/(2)logC`
`=7 +(1)/(2)(-logxx10^(-4)) +(1)/(2) log 0.01 = 8`
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Knowledge Check

  • The dissociation constant of a substitude benzoic acid at 25^(@)C is 1.0xx10^(-4) . The pH of a 0.01M solution of its sodium salt is

    A
    10
    B
    8
    C
    9
    D
    7

  • The dissociation constant of a weak monobasic acid K_(a) is 1xx 10^(-5) . The pH of 0.1 M of that acid would be

    A
    5
    B
    1
    C
    2
    D
    3