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What is [H^(+)] in a solution that is 0....

What is `[H^(+)]` in a solution that is 0.01 M in HCn and 0.02 M in NaCN ?
`(K_(a)` for HCN ` 6.2 xx 10^(-10))`

A

`3.1 xx 10^(10)`

B

`6.2 xx 10^(5)`

C

`6.2 xx 10^(-10)`

D

`3.1 xx 10^(-10)`

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The correct Answer is:
D
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