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What is the molar solubility of MgF(2) i...

What is the molar solubility of `MgF_(2)` in a 0.2 M solution of KF? `(K_(sp)=8xx10^(-8))`

A

`8xx10^(-8)M`

B

`8xx10^(-7)M`

C

`2xx10^(-6)M`

D

`2.7xx10^(-4)M`

Text Solution

Verified by Experts

The correct Answer is:
C
`Ksp=[Mg^(+2)][F]^(2)`
`Ksp=(5^('))(25^(')+c)^(2)`
`8xx10^(-8)=5^(')c^(2)`
`s^(')=(8xx10^(-8))/(4xx10^(-2))`
`=2xx10^(-6) M`
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