
Concept explainers
(a)
Interpretation:
Charge on Hg ion of HgS must be found out. The name of the compound must also be given.
Concept introduction:
A compound is formed from atoms of different elements such that the overall charge on the compound is neutral.

Answer to Problem 3E
The charge on mercury ion in HgS is + 2.
The name of the compound is mercuric sulfide.
Explanation of Solution
Mercury is in + 2 oxidation state and sulfur is in -2 oxidation state.
(b)
Interpretation:
The charge on the copper ion of CuCO3 must be found out.
Concept introduction:
A compound is formed from atoms of different elements such that the overall charge on the compound is neutral.

Answer to Problem 3E
The charge on the copper ion is + 2. The name of the compound is copper (II) carbonate.
Explanation of Solution
The given compound is CuCO3. Here, the charge on the carbonate ion is -2, thus, to form a compound in which copper and carbonate are in 1:1 ratio, the charge on the Cu should be + 2. The name of the compound will be cupric (II) carbonate or copper carbonate.
(c)
Interpretation:
Charge on nickel ion in NiCl2 must be found out.
Concept introduction:
A compound is formed from atoms of different elements such that the overall charge on the compound is neutral.

Answer to Problem 3E
The charge on nickel ion is + 2. The name of the compound is nickel (II) chloride.
Explanation of Solution
As chlorine belongs to the halogen family thus, it will have -1 charge. In the neutral compound,
Thus, the charge on Ni should be + 2 to form a neutral compound. The name of the compound will be nickel (II) chloride.
(d)
Interpretation:
Charge on cobalt ion in
Concept introduction:
A compound is formed from atoms of different elements such that the overall charge on the compound is neutral.

Answer to Problem 3E
The charge on cobalt ion is + 3. The name of the compound is cobalt (III) nitrate.
Explanation of Solution
The given compound is
The name of the compound will be cobalt (III) nitrate.
(e)
Interpretation:
The charge on the copper ion of
Concept introduction:
A compound is formed from atoms of different elements such that the overall charge on the compound is neutral.

Answer to Problem 3E
The charge on Cu is + 2 and the name of the compound is cupric hydroxide.
Explanation of Solution
The given compound is
The name of the compound is cupric hydroxide or copper (II) hydroxide.
(f)
Interpretation:
The charge on the iron ion of
Concept introduction:
A compound is formed from atoms of different elements such that the overall charge on the compound is neutral.

Answer to Problem 3E
The charge on the iron ion is + 2. The name of the compound is ferrous sulfate.
Explanation of Solution
The given compound is
The name of the compound will be ferrous sulfate or iron (II) sulfate.
Chapter U1 Solutions
Living By Chemistry: First Edition Textbook
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