1.

The solubility product of Mg(OH)_(2) is 1.2 xx 10^(-11). The solubility of this compound in gram per 100 cm^(3) of solution is

Answer»

`1.4 xx 10^(-4)`
`8.16 xx 10^(-4)`
0.816
1.4

Solution :`{:("Mg"(OH)_(2),hArr,"Mg"^(2+)+,2OH^(-)),(,,(S),(2S)^(2)):}`
`K_(sp) = 4S^(3) rArr S = 3sqrt((K_(sp))/(4)) = 3sqrt((1.2 xx 10^(-11))/(4))`
`S = 1.44 xx 10^(-4) mol L^(-1) = 58 xx 1.44 xx 10^(-4) g L^(-1)`
(mol. mass of `Mg(OH)_(2) = 50`)
`= 83.52 xx 10^(-4) g L^(-1) = 8.35 xx 10^(-4)g//100c C`.


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