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What will be the value of pH at which Mg...

What will be the value of pH at which `Mg(OH)_2` starts to precipitate from 0.1(M) of `MgCl_2` solution?
`[K_(sp)[Mg(OH)_2]=1.0xx10^(-11)`)

Text Solution

Verified by Experts

`Mg(OH)_2(s) `K_(sp)=[Mg^(2+)][OH^-]^2` or `10^(-11)=0.1xx(OH^-]^2`
or, `[OH^-]=10^(-5)(M)`, so, precipitation will occur when
`[OH^-]>10^(-5)(M)`, i.e `pOH>5` pH>9
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