Equilibrium - Complex Ion Solubility Calculation

[@PapaNiiMankatah]

Thank you!

[@khanhttran5]

A pH 8.0 solution of magnesium carbonate is saturated with MgCO3. What is the [Mg2+]? Ksp for MgCO3 = 3.5
x 10-8 and for H2CO3 K1 = 4.6 x 10-7 and K2 = 4.4 x 10-11
.
(a) 2.9 x 10-3 molar
(b) 1.9 x 10-4 molar
(c) 7.7 x 10-6 molar
How to do this?

[@hantairokomari9730]

Thank you