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Fe(OH)(2) is diacidic base has K(b1)=10^...

`Fe(OH)_(2)` is diacidic base has `K_(b1)=10^(-4)` and `K_(b2)=2.5xx10^(-6)` What is the concentration of `Fe(OH)_(2)` in 0.1 M `Fe(NO_(3))_(2)` solution?

A

`4xx10^(-9)`

B

`2.5xx10^(-6)`

C

`10^(-10)`

D

`10^(-14)`

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