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After solid Mg(OH)(2) was equilibrated ...

After solid `Mg(OH)_(2)` was equilibrated in `NH_(4)Cl` solution , the ammonium ion concentration was `0.50 ` M . Calculate `Mg^(2+)` in pure water is `2xx10^(-4) molL^(-1)`

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`6.16 xx10^(-3)M`
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