Concept explainers
(a)
Interpretation:
Formula of nickel (II) chloride hexahydrate needs to be determined.
Concept introduction:
Hexahydrates are those compound in which there are 6 water molecules as water of crystallization.

Answer to Problem 179A
Formula of nickel (II) chloride hexahydrate is NiCl2.6H2O.
Explanation of Solution
As shown in the formula there are 2 Cl atoms and the nickel is +2 oxidation state along with 6 water molecules as water of crystallization.
b)
Interpretation:
Formula of cobalt (II) chloride hexahydrate needs to be determined.
Concept introduction:
Hexahydrates are those compound in which there are 6 water molecules as water of crystallization.
b)

Answer to Problem 179A
Formula of cobalt (II) chloride hexahydrate is CoCl2.6H2O.
Explanation of Solution
As shown in the formula there are 2 Cl atoms and the cobalt is +2 oxidation state along with 6 water molecules as water of crystallization.
c)
Interpretation:
Formula of magnesium carbonate pentahydrate needs to be determined.
Concept introduction:
Pentahydrates are those compound in which there are 5 water molecules as water of crystallization.
c)

Answer to Problem 179A
Formula of magnesium carbonate pentahydrate is MgCO3.5H2O.
Explanation of Solution
As shown in the formula there is one carbonate radical along with magnesium ion. Magnesium is in+2 oxidation state along with 5 water molecules as water of crystallization.
d)
Interpretation:
Formula of sodium carbonate decahydrate needs to be determined.
Concept introduction:
Decahydrates are those compound in which there are 10 water molecules as water of crystallization.
d)

Answer to Problem 179A
Formula of sodium carbonate decahydrate is Na2CO3.10H2O.
Explanation of Solution
As shown in the formula there is one carbonate radical along with two sodium ions. Sodium is in+2 oxidation state along with 10 water molecules as water of crystallization.
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