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What is [NH(4)^(+)] in a solution that c...

What is `[NH_(4)^(+)]` in a solution that contain `0.02` M `NH_(3)(K_(b)=1.8xx10^(-5))` and `0.01` M KOH?

A

`9xx10^(-6)`

B

`1.8xx10^(-5)`

C

`3.6xx10^(-5)`

D

None of these

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