
(a)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(a)

Answer to Problem 81A
The chemical formula of magnesium sulfide is
Explanation of Solution
Magnesium sulfide is a binary ionic compound of magnesium and sulfur. Since both Mg and S are divalent atoms, there is no need for subscripts and hence the formula MgS.
(b)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(b)

Answer to Problem 81A
The chemical formula of sodium phosphite is
Explanation of Solution
The name phosphite denotes
(c)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(c)

Answer to Problem 81A
Barium hydroxide can be chemically represented as
Explanation of Solution
The ionic compound barium hydroxide contains group two metal barium with two positive charges. So two hydroxide ions are needed to maintain electrical neutrality, hence the formula is
(d)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(d)

Answer to Problem 81A
The chemical formula of copper (II) nitrite is
Explanation of Solution
The ionic compound copper nitrite consists of
(e)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(e)

Answer to Problem 81A
The chemical formula of potassium sulfite is
Explanation of Solution
The given ionic compound consists of potassium ions and sulfite ions
(f)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(f)

Answer to Problem 81A
Calcium carbonate can be chemically represented as
Explanation of Solution
Both calcium and carbonate are divalent ions, hence they simply combine to form calcium carbonate with the chemical formula
(g)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(g)

Answer to Problem 81A
The ionic compound sodium bromide can be chemically represented as NaBr.
Explanation of Solution
Sodium bromide is an ionic compound formed by the combination of metallic sodium and non-metal bromine. Both of them are monovalent, hence they simply combine to give NaBr.
(h)
Interpretation: The chemical formula of the given compound is to be determined.
Concept Introduction: Ionic compounds are named by writing the name of the metal ions followed by those of the anions. The name of an ionic compound ends in the suffix ‘-ide’ if it contains just two elements and in ‘-ate’ if it contains three or more elements.
(h)

Answer to Problem 81A
The chemical formula of the compound ferric sulfate is
Explanation of Solution
If a metal ion exhibits more than one cation charge, the suffix ‘-ic’ is used to represent the greater charge while ‘-ous’ is used to denote a lower one. Iron usually exists in +2 and +3 states, here the suffix ‘ic’ represents
Chapter 9 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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