Answer
See below
Work Step by Step
Calcium nitrate: Calcium is an alkaline earth metal, so its charge is +2. According to Table 2.2, nitrate's charge is -1. Two nitrate ions are needed to balance the charge, so we will place it in parentheses and subscript the entire ion with 2. Write the cation followed by the anion: Ca(NO$_3$)$_2$
Barium chloride: Barium is an alkaline earth metal, so its charge is +2. Chloride is the ion of a halogen, so its charge is -1. Two chloride ions are needed to balance the charge, so we will subscript it with 2. Write the cation followed by the anion: BaCl$_2$
Ammonium phosphate: According to Table 2.2, ammonium has a charge of +1, and phosphate has a charge of -3. Three ammonium ions are needed to balance the charge, so we will place it in parentheses and subscript it with 3. Write the cation followed by the anion: (NH$_4$)$_3$PO$_4$.
