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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

`3.6xx10^(-5) M`

B

`31.8xx10^(-5) M`

C

`0.9xx10^(-5) M`

D

`7.2xx10^(-5) M`

Text Solution

Verified by Experts

The correct Answer is:
A
`{:(NH_(4),OHhArr,NH_(4)^(+),+OH^(-),),(KOH,to,K^(+),+OH^(-),):}`
`K_(b)=([NH_(4)^(+)][OH^(-2)])/([NH_(4)OH])`
`1.8xx10^(-5)=([X][10^(-2)])/(2xx10^(-2))rArrx=3.6xx10^(-5)`
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