Chapter 9, Problem 80A

(a)

Interpretation Introduction

Interpretation: The chemical formula of a given compound is to be stated.

Concept Introduction: During the naming of ionic compounds containing polyatomic ions, the name of the metal is written followed by the name of the anion. The name of the anions ends with ‘-ide’ if there is only one element present, and ends with ‘-ate’ if there is more than one element present.

Answer to Problem 80A

The compound potassium permanganate can be chemically represented as ${\text{KMnO}}_{\text{4}}$ .

Explanation of Solution

Potassium permanganate comprises two parts potassium ion $\left({\text{K}}^{\text{+}}\right)$ and manganate ion $\left({\text{MnO}}_{\text{4}}{}^{-}\right)$ . These two ions combine to form ${\text{KMnO}}_{\text{4}}$ .

(b)

Interpretation Introduction

Interpretation: The chemical formula of a given compound is to be stated.

Concept Introduction: During the naming of ionic compounds containing polyatomic ions, the name of the metal is written followed by the name of the anion. The name of the anions ends with ‘-ide’ if there is only one element present, and ends with ‘-ate’ if there is more than one element present.

Answer to Problem 80A

The chemical formula of calcium hydrogen carbonate is $\text{Ca}{\left({\text{HCO}}_{\text{3}}\right)}_{\text{2}}$ .

Explanation of Solution

Calcium hydrogen carbonate contains ${\text{Ca}}^{\text{2+}}$ ions and hydrogen carbonate anions ${\left({\text{HCO}}_{\text{3}}\right)}^{-}$ . Since calcium has two positive charges two anions are needed to neutralize the compound, hence, the formula is $\text{Ca}{\left({\text{HCO}}_{\text{3}}\right)}_{\text{2}}$ .

(c)

Interpretation Introduction

Interpretation: The chemical formula of a given compound is to be stated.

Concept Introduction: During the naming of ionic compounds containing polyatomic ions, the name of the metal is written followed by the name of the anion. The name of the anions ends with ‘-ide’ if there is only one element present, and ends with ‘-ate’ if there is more than one element present.

Answer to Problem 80A

The chemical formula of dichlorine heptoxide is ${\text{Cl}}_{\text{2}}{\text{O}}_{\text{7}}$ .

Explanation of Solution

Dichlorine heptoxide is a molecular compound in which the chlorine and oxygen atoms share valence electrons. While naming molecular compounds, the number of each element present is written as the suffix, hence the chemical formula of the compound can be written as ${\text{Cl}}_{\text{2}}{\text{O}}_{\text{7}}$ .

(d)

Interpretation Introduction

Interpretation: The chemical formula of a given compound is to be stated.

Concept Introduction: During the naming of ionic compounds containing polyatomic ions, the name of the metal is written followed by the name of the anion. The name of the anions ends with ‘-ide’ if there is only one element present, and ends with ‘-ate’ if there is more than one element present.

Answer to Problem 80A

The chemical formula of trisilicon tetranitride is ${\text{Si}}_{\text{3}}{\text{N}}_{\text{4}}$ .

Explanation of Solution

Trisilicon tetranitride is a molecular compound formed between silicon and nitrogen. While naming molecular compounds, the number of each element present is written as the suffix, hence the chemical formula of the compound can be written as ${\text{Si}}_{\text{3}}{\text{N}}_{\text{4}}$ .

(e)

Interpretation Introduction

Interpretation: The chemical formula of a given compound is to be stated.

Concept Introduction: During the naming of ionic compounds containing polyatomic ions, the name of the metal is written followed by the name of the anion. The name of the anions ends with ‘-ide’ if there is only one element present, and ends with ‘-ate’ if there is more than one element present.

Answer to Problem 80A

Sodium dihydrogen phosphate is chemically represented as ${\text{NaH}}_2{\text{PO}}_{\text{4}}$ .

Explanation of Solution

The phosphate ion is a trivalent anion, whereas dihydrogen phosphate is a monovalent anion. It combines with sodium ions to form an ionic compound ${\text{NaH}}_2{\text{PO}}_{\text{4}}$ .

(f)

Interpretation Introduction

Interpretation: The chemical formula of a given compound is to be stated.

Concept Introduction: During the naming of ionic compounds containing polyatomic ions, the name of the metal is written followed by the name of the anion. The name of the anions ends with ‘-ide’ if there is only one element present, and ends with ‘-ate’ if there is more than one element present.

Answer to Problem 80A

Phosphorous pentabromide can be chemically represented as ${\text{PBr}}_{\text{5}}$ .

Explanation of Solution

Phosphorous pentabromide is a molecular compound formed by the non-metals phosphorous and bromine. Phosphorous is a pentavalent element that combines with five monovalent bromine atoms to form ${\text{PBr}}_{\text{5}}$ .