# Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Exercises - Page 86: 2.89

(a) Sr(NO$_3$)$_2$ (b) NaH$_2$PO$_4$ (c) KClO$_4$ (d) LiHSO$_4$

#### Work Step by Step

(a) Sr(NO$_3$)$_2$ Strontium (Sr) is an alkaline earth metal and has a valence of 2+. We refer to the table of polyatomic anions (Table 2.2) on page 65 of the book to find the formula and charge for nitrate (NO$_3$$^-). We will need one strontium ion for every two nitrate ions to balance the charges in this compound. (b) NaH_2PO_4 Sodium (Na) is an alkali metal and has a valence of 1+. We refer to the table of polyatomic anions (Table 2.2) on page 65 of the book to find the formula and charge for dihydrogen phosphate (H_2PO_4$$^-$). We will need one sodium ion for every one dihydrogen phosphate ion to balance the charges in this compound. (c) KClO$_4$ Potassium (K) is an alkali metal and has a valence of 1+. We refer to the table of polyatomic anions (Table 2.2) on page 65 of the book to find the formula and charge for perchlorate (ClO$_4$$^-). We will need one potassium ion for every one perchlorate ion to balance the charges in this compound. (d) LiHSO_4 Lithium (Li) is an alkali metal and has a valence of 1+. We refer to the table of polyatomic anions (Table 2.2) on page 65 of the book to find the formula and charge for hydrogen sulfate (HSO_4$$^-$). We will need one lithium ion for every one hydrogen sulfate ion to balance the charges in this compound.

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