Question

How do we find gram solubilities of metal hydroxides?

Answer 1

You need to quote `K_"sp"` values for the hydroxides of metal ions........

Explanation:

The `K_"sp"` values are of course available in the literature, and SHOULD have been included in the question.

Once we have `K_"sp"` values, then we can address the various solubility. For calcium chloride we approach this in this manner........

`Ca(OH)_2(s) rightleftharpoons Ca^(2+)+2HO^-`

Now `K_"sp"=[Ca^(2+)][HO^-]^2`.

And if we call the solubility of calcium chloride, `S`, then `S=[Ca^(2+)]`, and `[Cl^-]=2S` (provided there is no extraneous source of calcium and chloride ions......)

So `K_"sp"=Sxx(2S)^2=4S^3`.

And `S=""^3sqrt((K_"sp")/4)`.

And so without `K_"sp"` we are at an impasse. Such calculations require prior measurement or reference to the literature data.