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What is [H^(+)] in mol/L of a solution t...

What is `[H^(+)]` in mol/L of a solution that is 0.20 M in `CH_(3)COONa` and 0.10 M in `CH_(3)COOH` ? `(K_(a)` for `CH_(3)COOH=1.8xx10^(-5))`

A

`3.5 xx 10^(-4)`

B

`1.1 xx 10^(-5)`

C

`1.8 xx 10^(-5)`

D

`9.0 xx 10^(-6)`

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The correct Answer is:
D
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What is [H^(+)] in mol//L of a solution that is 0.20 M in CH_(3)COONa and 0.1 M in CH_(3)COOH ? K_(a) for CH_(3)COOH is 1.8xx10^(-5) ?

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