Answer
Barium sulfate: BaSO$_4$, consisting of barium, +2 and sulfate, -2
Magnesium nitrate: Mg(NO$_3$)$_2$, consisting of magnesium, +2 and nitrate, -1
Sodium acetate: NaCH$_3$COO, consisting of sodium, +1 and acetate, -1
Work Step by Step
Barium sulfate: Barium is an alkaline earth metal, so its charge is +2. According to Table 2.2, sulfate has a charge of -2. They will be in a 1:1 ratio, so we simply write the cation followed by the anion: BaSO$_4$.
Magnesium nitrate: Magnesium is an alkaline earth metal, so its charge is +2. According to Table 2.2, nitrate has a charge of -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: Mg(NO$_3$)$_2$.
Sodium acetate: Sodium is an alkali metal, so its charge is +1. According to Table 2.2, acetate has a charge of -1. They will be in a 1:1 ratio, so simply write the cation followed by the anion: NaCH$_3$COO.
