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

What is the molar solubility of `Fe(OH)_2 (K_(sp) =8.0 xx 10^(-16) ) ` at pH 13.0 ?

A

`8.0 xx 10^(-18) `

B

` 8.0 xx 10^(-15)`

C

` 8.0 xx 10^(-17) `

D

` 8.0 xx 10^(-14)`

Text Solution

Verified by Experts

The correct Answer is:
D
` Fe( OH)_2 hArr Fe^(+2) +2OH^(-) `
` " " S " " (2S +0.1 ) `
` 8 xx 10 ^(-16) =(S) ( cancel (2S) +0.1 ) ^(2) `
` S= 8 xx 10 ^(-14) M`
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