Calomel, Hg2Cl2, is a compound composed of the diatomic ion of mercury(I), Hg2 2+, and chloride ions, Cl–. Although most mercury compounds are now known to be poisonous, eighteenth-century physicians used calomel as a medication. Their patients rarely suffered any mercury poisoning from the treatments because calomel is quite insoluble:Hg2 Cl2(s) ⇌ Hg2 2+(aq) + 2Cl−(aq)                Ksp = 1.1 × 10−18Calculate the molar solubility of Hg2Cl2.

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