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The numerical value of solubility produc...

The numerical value of solubility product of magnesium hydroxide at `25^@ C `is `3.2 xx 10^(-11)`. What is its solubility ?

Text Solution

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The solubility equilibrium of magnesium hydroxide, `Mg(OH)_2 hArr Mg^(2+) + 2OH^(-)`
If the solubility is x for `AB_2` type substance, solubility product is `4x^3`.
`4x^3 = 3.2 xx 10^(-11) , x = 8 xx 10^(-12)` and hence, `x = 2 xx 10^(-4)`
Solubility of `Mg(OH)_2 = 2 x x 10^(-4) mol L^(-1)`
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