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The solubility product constant of a met...

The solubility product constant of a metal carbonate `MCO_(3)` is `2 xx 10^(-12)` at `25^(@)C`. A solution is `0.1 M` in `M(NO_(3))_(2)` and it is saturated with `0.01 M CO_(3)`. Also the ionization constant of `CO_(2)` are : `K_(a_(1)) = 4 xx 10^(-7)` and `K_(a_(2)) = 5 xx 10^(-11)` at `25^(@)C`. The minimum pH that must be maintained to start any precipitation is

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