posted by Jonah on .
Which of the following salts is NOT more soluble in acidic solution than in pure water?
The answer is E, but I don't know why or how I would go about answering a question like this. What would I have to consider to determine this?
Since acid is H^+ you look for an anion that combines with H^+ to give a WEAK acid (one that has an ionization constant).
ZnS gives H^+ + S^2- ==> HS^- which is k2 for H2S.
AgCN gives H^+ + CN^- ==> HCN which has a Ka.
Ba3(PO4)2 gives H^+ + PO4^3- ==> HPO4^2- which is k3 for H3PO4.
ZnCO3 gives H^+ + CO3^2- ==> HCO3^- which is k2 for H2CO3.
BiI3 gives H^+ + I^- == HI WHICH HAS NO k VALUE BECAUSE IT IS A STRONG ACID; IE., IONIZED 100%.