Chapter 9, Problem 84A

(a)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The name of the given compound is magnesium manganate.

Explanation of Solution

Magnesium is a dipositive ion that combines with two manganate ions to form magnesium manganate. The name of the metal ion is written first followed by the name of the anion.

(b)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The name of the compound with its chemical formula $\text{Be}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}$ is beryllium nitrate.

Explanation of Solution

The symbol Be indicates beryllium ion and ${\text{NO}}_{\text{3}}{}^{-}$ denotes nitrate ion. So the name of the compound is beryllium nitrate.

(c)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The name of the given compound is potassium carbonate.

Explanation of Solution

The chemical symbol K stands for potassium and the ${\text{CO}}_{\text{3}}{}^{2-}$ represents carbonate ion. Hence the name potassium carbonate. Since it is an ionic compound there is no need to add the prefix ‘di’.

(d)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The chemical name of the compound ${\text{N}}_{\text{2}}{\text{H}}_{\text{4}}$ is dinitrogen tetrahydride.

Explanation of Solution

  ${\text{N}}_{\text{2}}{\text{H}}_{\text{4}}$ is a molecular compound containing two nitrogen atoms and four hydrogen atoms. Hence it is named dinitrogen tetrahydride. The prefixes ‘di’ and ‘tetra’ are used to denote the numbers two and four respectively.

(e)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The name of the given compound is lithium hydroxide.

Explanation of Solution

The given compound contains a lithium-ion and a hydroxide ion held together by electrostatic force. The name of the cation is written first followed by that of the anion. Hence the name of the compound is lithium hydroxide.

(f)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The chemical name of the compound ${\text{BaF}}_{\text{2}}$ is barium fluoride.

Explanation of Solution

While naming ionic compounds, the name of the metal ion is written first followed by the name of the negative ion. Since ionic compounds are electrically neutral we don’t need to specify the number of each ion present by using prefixes.

(g)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The chemical name of the compound ${\text{PI}}_{\text{3}}$ is potassium triiodide.

Explanation of Solution

  ${\text{PI}}_3$ is a molecular compound containing a phosphorous atom and three iodine atoms. Hence it is named potassium triiodide. The prefixes ‘tri’ is used to denote three.

(h)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The name of the given compound is zinc oxide.

Explanation of Solution

The given ionic compound contains two elements zinc and oxygen. Since there are only two elements the suffix ‘-ide’ is used. So, the name of the compound is zinc oxide.

(i)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: Ionic compounds are named by writing the name of the metal with its charge in Roman numerals in parentheses followed by the name of the anion. Ionic compounds are electrically neutral.

Answer to Problem 84A

The name of the compound ${\text{H}}_{\text{3}}{\text{PO}}_{\text{3}}$ is phosphorous acid.

Explanation of Solution

  ${\text{H}}_{\text{3}}{\text{PO}}_{\text{3}}$ is an acid. While naming acids, if the anion is a polyatomic ion whose name ends with ‘-ite’ then the suffix ‘-ous’ is used for the acid. Thus, the name phosphorous acid.