Answer
(a) $(NH_4)_2S:$ is soluble.
The ions are: $NH_4^+$ and $S^{2-}$.
(b) $CuCO_3$ is insoluble.
(c) $ZnS$ is insoluble.
(d) $Pb(C_2H_3O_2)_2$ is soluble.
The ions are: $Pb^{2+}$ and $C_2H_3O_2^-$.
Work Step by Step
Use the information in table 7.2 (Page 217), to predict the solubility of these compounds:
Use the same figure to help when identifying the ions.
(a) $(NH_4)_2S:$ Almost all compounds with $NH_4^+$ are soluble.
The ions are: $NH_4^+$ and $S^{2-}$.
(b) $CuCO_3$: Compounds with $CO_3^{2-}$ are, most of the times, insoluble.
(c) $ZnS$: Compounds with $S^{2-}$ are, most of the times, insoluble.
(d) $Pb(C_2H_3O_2)_2$: Almost all compounds with the acetate ion: $C_2H_3O_2^-$ are soluble.
The ions are: $Pb^{2+}$ and $C_2H_3O_2^-$.
