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Milk of magnesia is only slightly soluble in water. Kc for the reaction Mg(OHs)(s)>Mg2+(a) + 2OH-1(aq)...

Milk of magnesia is only slightly soluble in water. Kc for the reaction Mg(OHs)(s)>Mg2+(a) + 2OH-1(aq) is 5.6x10^-12. How many moles of Mg2+ and how many moles of OH-1 will exist at equilibrium in 5L saturated solution of Mg(OH)2? Does the answer make sense?

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Answer #1

The answer doesn't make any sense actually as the number of moles of Mg2+ and OH- at equlibrium is very very small compared to 1 which is the initial number of moles of milk of magnesia.

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