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Q 2643112043.     Which of the following concentrations of NH4 +will be sufficient to prevent the precipitation of `Mg(OH)_2` from a solution which is 0.01 M `MgCI_2` and 0.1 M `NH_3` (aq). Given that: `K_(sp)` of `Mg(OH)_2 = 2 5 xx 10^-11` and `K_b` for `NH_3(aq) = 2 xx 10^-5`.
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