## Chemistry: Molecular Approach (4th Edition)

a. When $Cl^-$, $Br^-$ or $I^-$ react with $Ag^+$, $Hg_2^{2+}$ or $Pb^{2+}$, the resulting ionic compound is insoluble. b. Most of the time, compounds with $P{O_4}^{3-}$ are insoluble. c. Most of the time, compounds with $C{O_3}^{2-}$ are insoluble. d. Any common compound with $K^+$ is soluble.