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Which of the following sequences correctly represents the solubility order of the slightly soluble salts \(Hg_2Cl_2\), \(Cr_2(SO_4)_3\), \(BaSO_4\), and \(CrCl_3\)?

1. BaSO4 > Hg2Cl2 > Cr2(SO4)3 > CrCl3
2. BaSO4 > CrCl3 > Hg2Cl2 > Cr2(SO4)3
3. Hg2Cl2 > BaSO4 > CrCl3 > Cr2(SO4)3
4. Hg2Cl2 > BaSO4 > Cr2(SO4)3 > CrCl3

Correct answer: BaSO4 > Hg2Cl2 > Cr2(SO4)3 > CrCl3

Solution

For slightly soluble salts, solubility depends on both \(K_{sp}\) and the dissociation stoichiometry. Using standard relative solubilities, \(BaSO_4\) is more soluble than \(Hg_2Cl_2\), which is more soluble than \(Cr_2(SO_4)_3\), and \(CrCl_3\) is the least soluble among the given set.

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