Which of the following salts, each having very limited solubility in water, would dissolve to a greater extent upon acidifying the solution?
I. Fe(OH) ₃
II. AgCN
III. PbI₂

Question

Which of the following salts, each having very limited solubility in water, would dissolve to a greater extent upon acidifying the solution? I. Fe(OH)₃ II. AgCN III. PbI₂

Quizplus · Accepted Answer

Salts containing the anions of weak acids (like CN^- from HCN and S^2- from H2S in Fe(OH)2S and AgCN) will dissolve more upon acidifying the solution because the added acid will react with these anions, reducing their concentration and shifting the equilibrium towards more dissolution of the salt. PbI2 does not fit this description as I^- comes from the strong acid HI, and its solubility is not significantly affected by acidifying the solution.

Which of the Following Salts, Each Having Very Limited Solubility