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Question

pH of 0.5 M Ba(CN)2 solution (pKb of CN=9.30) is :


A

8.35

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B

3.35

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C

9.35

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D

9.50

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Solution

The correct option is C

9.35


[CN]=2×0.5=1.0MpH=12(pKw+pKa+log[CN])=12[14+(14pKb)+log 1]=12[289.30]=9.35


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