Chapter 11, Problem 74A

(a)

Interpretation Introduction

Interpretation:

The formula of potassium chromate needs to be determined.

Concept Introduction:

Chemical formula is the representation of the compound in symbols. In the chemical formula, positive ions are written first and the valences of ions are exchanged.

Answer to Problem 74A

The chemical formula of potassium chromate is ${\text{K}}_{\text{2}}{\text{CrO}}_{\text{4}}$ .

Explanation of Solution

Positive ion in potassium chromate is the potassium ion having the symbol K and the valency of potassium is $\text{1+}$ .

Negative ion in potassium chromate is a chromate ion having a symbol ${\text{CrO}}_4{}^{2-}$ and the valency of the chromate ion is $2-$ .

Hence, the formula is: ${\text{K}}_{\text{2}}{\text{CrO}}_{\text{4}}$

(b)

Interpretation Introduction

Interpretation:

The formula of sodium hydrogen sulfite needs to be determined.

Concept Introduction:

Chemical formula is the representation of the compound in symbols. In the chemical formula, positive ions are written first and the valences of ions are exchanged.

Answer to Problem 74A

The formula of sodium hydrogen sulfite is ${\text{NaHSO}}_{\text{3}}$ .

Explanation of Solution

Positive ion in sodium hydrogen sulfite is sodium ion having symbol $\text{Na}$ and valency is $\text{1+}$ .

Negative ion in sodium hydrogen sulfite is hydrogen sulfite having formula ${\text{HSO}}_3$ and the valency is $1-$

Hence, the formula of sodium hydrogen sulfite is ${\text{NaHSO}}_{\text{3}}$

(c)

Interpretation Introduction

Interpretation:

The name of ${\text{HMnO}}_4$ needs to be determined.

Concept Introduction:

Chemical formula is the representation of the compound in symbols. In the chemical formula, positive ions are written first and the valences of ions are exchanged.

Answer to Problem 74A

The name of ${\text{HMnO}}_4$ is permanganic acid.

Explanation of Solution

The chemical formula given is ${\text{HMnO}}_4$ . This compound is an inorganic acid and its name is permanganic acid.

(d)

Interpretation Introduction

Interpretation:

The name of the compound ${\text{K}}_2{\text{C}}_2{\text{O}}_4$ needs to be determined.

Concept Introduction:

Chemical formula is the representation of the compound in symbols. In the chemical formula, positive ions are written first and the valences of ions are exchanged.

Answer to Problem 74A

The name of the compound ${\text{K}}_2{\text{C}}_2{\text{O}}_4$ is Potassium oxalate.

Explanation of Solution

The compound given is ${\text{K}}_2{\text{C}}_2{\text{O}}_4$ . Here, ${\text{K}}^{+}$ is a potassium ion and ${\text{C}}_{\text{2}}{\text{O}}_{\text{4}}{}^{2-}$ is chromate ion. Thus, the name of the compound is Potassium oxalate.