For each of the salts on the left, match the salts on the right that can be compared directly, using $K_{sp}$ values, to estimate solubilities $($If more than one salt on the right can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e$.$g$,$ ABC.$)$

calcium sulfide

A$.Pb{I}_2$

nickel$($II$)$ cyanide

B$.B{a}_3(P{O}_4{)}_2$

C$.$ CoS

D$.CaS{O}_3$

Write the expression for $K$ in terms of the solubility, $s,$ for each salt, when dissolved in water.

calcium sulfide

$K_{sp}=$

nickel$($II$)$ cyanide

$K_{sp}=$