Chapter 5, Problem 78AP

For the following pairs of ions, use the principle of electrical neutrality to predict the formula of the binary compound that the ions are most likely to form.

1. ${\text{Na}}^{+}{\text{and S}}^{2-}$  e. ${\text{Cu}}^{2+}{\text{and Br}}^{-}$

   ${\text{K}}^{+}{\text{and Cl}}^{-}$  f. ${\text{Al}}^{3+}{\text{and I}}^{-}$

   ${\text{Ba}}^{2+}{\text{and O}}^{2-}$  g. ${\text{Al}}^{3+}{\text{and O}}^{2-}$

   ${\text{Mg}}^{2+}{\text{and Se}}^{2-}$  h. ${\text{Ca}}^{2+}{\text{and N}}^{3-}$

Interpretation Introduction

(a)

Interpretation:

To determine the formula of the ionic species Na+ and S^2-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula ofionic species Na+ and S² - is Na₂ S.

Explanation of Solution

The species Na+ has charge + 1 and S² - has charge -2. To make the neutral compound, charge must be balanced so, Na is multiplied by 2 to get the charge equal to the charge of S2- i.e. 2. Hence, formula is Na₂ S.

Interpretation Introduction

(b)

Interpretation:

To determine the formula of the ionic species K+ and Cl^-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula of the ionic species K+ and Cl-isKCl.

Explanation of Solution

The species K+ has charge + 1 and Cl- has charge -1. To make the neutral compound, charge must be balanced so, K is multiplied by 1 to get the charge equal to the charge of Cl i.e. 1. Hence, formula isKCl.

Interpretation Introduction

(c)

Interpretation:

To determine the formula of the ionic species Ba² + and O^2-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula of the ionic species Ba² + and O² - is BaO.

Explanation of Solution

The species Ba² + has charge + 2 and O² - has charge -2. To make the neutral compound, charge must be balanced so, Ba is multiplied by 1 to get the charge equal to the charge of Cl i.e. 2. Hence, formula isBaO.

Interpretation Introduction

(d)

Interpretation:

To determine the formula of the ionic species Mg² + and Se^2-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula of the ionic species Mg² + and Se² - is MgSe.

Explanation of Solution

The species Mg² + has charge + 2 and Se² - has charge -2. To make the neutral compound, charge must be balanced so, Mg is multiplied by 1 to get the charge equal to the charge of Se² -i.e. 2. Hence, formula isMgSe.

Interpretation Introduction

(e)

Interpretation:

To determine the formula of the ionic species Cu² + and Br^-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula of the ionic species Cu² + and Br- is CuBr₂.

Explanation of Solution

The species Cu² + has charge + 2 and Br- has charge -1. To make the neutral compound, charge must be balanced so, Mg is multiplied by 1 and Br is multiplied by 2 to get the charge equal to the charge of Br-i.e. 1. Hence, formula is CuBr₂.

Interpretation Introduction

(f)

Interpretation:

To determine the formula of the ionic species Al³ + and I^-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula of the ionic species Al³ + and I- is AlI₃.

Explanation of Solution

The species Al³ + has charge + 3 and I- has charge -1. To make the neutral compound, charge must be balanced so, Ag is multiplied by 1 and I is multiplied by 3 to get the charge equal to the charge of Br-i.e. 3. Hence, formula is AlI₃.

Interpretation Introduction

(g)

Interpretation:

To determine the formula of the ionic species Al³ + and O^2-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula of the ionic species Al³ + and O² -.

Explanation of Solution

The species Al³ + has charge + 3 and O² - has charge -2. To make the neutral compound, charge must be balanced so, Al is multiplied by 2 and O₂ is multiplied by 3 to get the charge equal to the charge of Br. Hence, formula is Al₂ O₃.

Interpretation Introduction

(h)

Interpretation:

To determine the formula of the ionic species Ca² + and N^3-.

Concept Introduction:

Binary compound is formed by combining two species one has negative charge and positive charge. The principle of electrical neutrality is used to determine the formula of the binary compound.

There are two type of charge i.e. positive and negative charge species are combine together with balancing the total charge of a compound.

The ionic compound are formed by combining of oppositely charged ions.

Answer to Problem 78AP

Formula ofionic species Ca² + and N³ -is Ca₃ N₂.

Explanation of Solution

The species Ca² + has charge + 2 and N³ - has charge -3. To make the neutral compound, charge must be balanced so, Ca is multiplied by 3 and N is multiplied by 2 to get the charge equal to the charge of N and Ca.. Hence, formula is Ca₃ N₂.