Chapter 9, Problem 75A

(a)

Interpretation Introduction

Interpretation: The chemical formula of the given compound should be determined.

Concept Introduction: Binary acids are named by using the prefix ‘hydro-‘followed by the base name of the anion and then the suffix ‘-ic’ is used. In the case of oxoacids, the base name of oxoanion has the suffix ‘-ous’ or ‘-ic.

Answer to Problem 75A

The chemical formula of nitrous acid is ${\text{HNO}}_{\text{2}}$ .

Explanation of Solution

Nitrous acid contains hydrogen ions and nitrite ions. If the anion name of an acid containing oxygen ends in ‘-ite’ then the name of the acid ends in ‘-ous’. So, in nitrous acid, the anion is a nitrite ion, hence the name ${\text{HNO}}_{\text{2}}$ .

(b)

Interpretation Introduction

Interpretation: The chemical formula of the given compound should be determined.

Concept Introduction: Binary acids are named by using the prefix ‘hydro-‘followed by the base name of the anion and then the suffix ‘-ic’ is used. In the case of oxoacids, the base name of oxoanion has the suffix ‘-ous’ or ‘-ic.

Answer to Problem 75A

Aluminum hydroxide can be chemically represented as $\text{Al}{\left(\text{OH}\right)}_{\text{3}}$ .

Explanation of Solution

Aluminum hydroxide contains ${\text{Al}}^{\text{3+}}$ ions and ${\text{OH}}^{-}$ ions. To maintain electrical neutrality three hydroxide ions are needed per aluminum ion. the three is written as a subscript, hence, it is represented as $\text{Al}{\left(\text{OH}\right)}_{\text{3}}$ .

(c)

Interpretation Introduction

Interpretation: The chemical formula of the given compound should be determined.

Concept Introduction: Binary acids are named by using the prefix ‘hydro-‘followed by the base name of the anion and then the suffix ‘-ic’ is used. In the case of oxoacids, the base name of oxoanion has the suffix ‘-ous’ or ‘-ic.

Answer to Problem 75A

The chemical formula of hydroselenic acid is ${\text{H}}_{\text{2}}\text{Se}$ .

Explanation of Solution

Hydroselenic acid consists of two hydrogen atoms bonded to a selenium atom. So, the formula can be written as ${\text{H}}_{\text{2}}\text{Se}$ .

(d)

Interpretation Introduction

Interpretation: The chemical formula of the given compound should be determined.

Concept Introduction: Binary acids are named by using the prefix ‘hydro-‘followed by the base name of the anion and then the suffix ‘-ic’ is used. In the case of oxoacids, the base name of oxoanion has the suffix ‘-ous’ or ‘-ic.

Answer to Problem 75A

Strontium hydroxide can be chemically represented as $\text{Sr}{\left(\text{OH}\right)}_{\text{2}}$ .

Explanation of Solution

Strontium is an alkaline earth metal that forms ${\text{Sr}}^{\text{2+}}$ ions. It combines with two hydroxide ions to form $\text{Sr}{\left(\text{OH}\right)}_{\text{2}}$ .

(e)

Interpretation Introduction

Interpretation: The chemical formula of the given compound should be determined.

Concept Introduction: Binary acids are named by using the prefix ‘hydro-‘followed by the base name of the anion and then the suffix ‘-ic’ is used. In the case of oxoacids, the base name of oxoanion has the suffix ‘-ous’ or ‘-ic.

Answer to Problem 75A

The chemical formula of phosphoric acid is ${\text{H}}_{\text{3}}{\text{PO}}_{\text{4}}$ .

Explanation of Solution

Phosphoric acid is formed by the combination of phosphate ion with hydrogen ion. Phosphate is a polyatomic anion with a -3 charge, which is neutralized by three hydrogen atoms. Thus, the chemical formula is ${\text{H}}_{\text{3}}{\text{PO}}_{\text{4}}$ .