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What [NH4^(+) ] in a solution that conta...

What `[NH_4^(+) ]` in a solution that contains `0.02M NH_3 (K_b =1.8 xx 10^(-5) ) and 0.01 M KOH` ?

A

`9 xx 10^(-6)`

B

` 1. 8 xx 10^(-5)`

C

` 3.6 xx 10^(-5)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
`K_b =([NH_4^(+) ][OH^(-)])/( [NH_4OH]) , 1.8 xx 10 ^(-5) =([NH_4^(+) ][10^(-2)])/( 2xx10 ^(-2))`
` [NH_4^(+)] =3.6 xx 10 ^(_5) `
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