1.

The 0.001 M Solution of Mg (NO_(3))_(2) is adjusted to pH9, K_(sp) of Mg (OH)_(2) is 8.9xx10^(-12). At this pH

Answer»

`Mg(OH)_(2)` will be precipitated.
`Mg(OH)_(2)` is not precipitated.
`Mg(OH)_(3)` will be precipitated.
`Mg(OH)_(3)` is not precipitated.

Solution :`pH=9,[H^(+)]=10^(-9),[OH^(-)]=10^(-5),`
`[HG^(2+)]=1xx10^(-3),[Mg^(2+)][OH^(-)]^(2)=1xx10^(-13)`
GIVEN `K_(sp)` of `Mg(OH)_(2)=8.9xx10^(-12)` which is more than `1xx10^(-13)`. HENCE `Mg(OH)_(2)` will not precipitate


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