Chapter 9.2, Problem 23LC

(a)

Interpretation Introduction

Interpretation: The formula of the given ionic compound containing polyatomic ions is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 23LC

The formula of the given compound is $\text{Cr}{\left({\text{NO}}_{\text{2}}\right)}_3$ .

Explanation of Solution

The given compound is chromium (III) nitrite. It is composed of ${\text{Cr}}^{3+}$ and ${\text{NO}}_{\text{2}}{}^{-}$ ions. By the criss-cross method, the chemical formula of the compound is $\text{Cr}{\left({\text{NO}}_{\text{2}}\right)}_3$ .

(b)

Interpretation Introduction

Interpretation: The formula of the given ionic compound containing polyatomic ions is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 23LC

The formula of the given compound is ${\text{NaClO}}_{\text{4}}$ .

Explanation of Solution

The given compound is sodium perchlorate. It is composed of ${\text{Na}}^{+}$ and ${\text{ClO}}_{\text{4}}{}^{-}$ . By the criss-cross method, the chemical formula of the compound is ${\text{NaClO}}_{\text{4}}$ .

(c)

Interpretation Introduction

Interpretation: The formula of the given ionic compound containing polyatomic ions is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 23LC

The formula of the given compound is $\text{Mg}{\left({\text{HCO}}_{\text{3}}\right)}_2$ .

Explanation of Solution

The given compound is magnesium hydrogen carbonate. It is composed of ${\text{Mg}}^{2+}$ and ${\text{HCO}}_{\text{3}}{}^{-}$ . By the criss-cross method, the chemical formula of the compound is $\text{Mg}{\left({\text{HCO}}_{\text{3}}\right)}_2$ .

(d)

Interpretation Introduction

Interpretation: The formula of the given ionic compound containing polyatomic ions is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 23LC

The formula of the given compound is $\text{Ca}{\left(\text{HCOO}\right)}_2$ .

Explanation of Solution

The given compound is calcium acetate. It is composed of ${\text{Ca}}^{2+}$ and ${\text{HCOO}}^{-}$ . By the criss-cross method, the chemical formula of the compound is $\text{Ca}{\left(\text{HCOO}\right)}_2$ .