Answer
a. Insoluble
b. Soluble.
c. Soluble.
d. Insoluble.
e. Insoluble.
Work Step by Step
a. $Pb^{2+}$ and $S^{2-}$ do not appear in the Table 9.7, so, $PbS$ is insoluble.
b. Compounds with the $K^+$ ion are soluble in water.
c. Compounds with the $Na^+$ ion are soluble in water.
d. $Ag^{+}$ and $O^{2-}$ do not appear in the Table 9.7, so, $Ag_2O$ is insoluble.
e. According to the Table 9.7, compounds with $S{O_4}^{2-}$ are normally soluble, but the one with $Ca^{2+}$ is an exception.
