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What is the aq. Ammonia concentration of...

What is the aq. Ammonia concentration of a solution prepared by dissolving 0.15 mole of `NH_4^+CH_3COO^-` in 1 L `H_2O` ?
`[K_(a(CH_3COOH))=1.8xx10^(-5)=K_(b(NH_3))]`

A

`8.3xx10^(-4)`

B

0.15

C

`6.4xx10^(-4)`

D

`3.8xx10^(-4)`

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The correct Answer is:
a
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