Let the solubility of each given salt be S. 3+ 2- 2 3 3 5 sp 1/5 1/5 17 3 sp + 2 2 2 3 sp 1/3 1/3 51 2 17 2+ 2 Bi S 2Bi aq. 3S aq. K 2s 3s 108s s K /108 1 10 /108 0.98 10 Ag S s aq. S aq. K 2s 4s s / 4 6 10 / 4 1.1 10 MnS s aq. S aq. 2Ag s Mn x x x x sp K 2 sp 16 8 1 sp K s s K 7 10 2.64 10 molL x x 2 2 2 sp 37 18 1 sp CuS s aq. S aq. K s s K 8 10 8.9 10 molL Cu x x Thus, the most soluble compound is Bismuth Sulfide.
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