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pH of a saturated solution fo magnesium ...

pH of a saturated solution fo magnesium hydroxide in water at `298K` is 10. The solubility of the hydroxide in water at 298 K is

A

`5xx10^(-5)molL^(-1)`

B

`5xx10^(-12)molL^(-1)`

C

`1xx10^(-4)molL^(-1)`

D

`1xx10^(-10)molL^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`Mg(OH)_(2)iffMg^(2+)+2OH^(-)`
pH of `Mg(OH)_(2)` solution is 10
`becausepOH=4`
So `[OH^(-)]=10^(-4)`
`[OH^(-)]=2xx"solubility"`
`because "solubility"=(10^(-4))/(2)=0.5xx10^(-4)=5xx10^(-5)molL^(-1)`
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