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What is the molar solubility of Mn(OH)(2...

What is the molar solubility of `Mn(OH)_(2)``(K_(sp)=4.5xx10^(-14))` in a buffer solution containing equal amounts of `NH_(4)^(+)` and `NH_(3)` `(K_(b)=1.8xx10^(-5))`?

A

`3.0xx10^(-4)`

B

`1.38xx10^(-4)`

C

`1.38xx10^(-3)`

D

`7.3xx10^(-4)`

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