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Question

In a buffer solution, the concentration of X and HX are equivalent. If Kb for X is 1010 then pH of the solution would be :
(PMT, Rajasthan, 1997)

A
14
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B
10
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C
4
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D
8
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Solution

The correct option is C 4
The expression for the pOH of the basic buffer solution is as given below.
pOH=pKb+log[Salt][Base]
pKb=logKb=log(1010)=10
Substitute values in the above equation.
pOH=10+log11=10
pH=14pOH=1410=4.

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