## Chemistry and Chemical Reactivity (9th Edition)

a) $K^+, I^-$ b) $Mg^{2+}, 2\ CH_3CO_2^{-}$ c) $2\ K^+, HPO_4^{2-}$ d) $Na^+, CN^{-}$
This problem requires familiarization with common ions, a) $K^+, I^-$ b) $Mg^{2+}, 2\ CH_3CO_2^{-}$ c) $2\ K^+, HPO_4^{2-}$ d) $Na^+, CN^{-}$