Question

(c)
Give balanced equations for the following conversion A to E.
Cu A, Cuo B., Cuso, Cu(OH), B, Cu(NO3),
E​

Answer 1

Illustrate variety of substances of which an element can be part:

metal --> blue solution --> blue solid --> black solid --> blue solution (again) --> metal (again).

Conservation of mass and of moles:

We should recover as much copper as we started with.

Same amount of copper present at every stage: same number of moles.

Experience in standard chemical techniques: filtration and quantitative transfers.

Reactions

Cu(s) --> [Cu(H2O)6]2+(aq) --> Cu(OH)2(s) --> CuO(s) --> [Cu(H2O)6]2+(aq) --> Cu(s)

Copper metal "dissolves" in nitric acid (HNO3). Actually, the nitrate ion oxidizes the copper metal to copper (II) ion while itself being transformed to NO2 gas in the process; the copper (II) ion then binds to six water molecules. The physical change you should observe is the copper-colored metal vanishing as the solution turns blue (from [Cu(H2O)6]2+, the hexaaquacopper ion) and a brown gas (NO2) is evolved.

Cu (s) + 4 H3O+ (aq) + 2 NO3- (aq) --> [Cu(H2O)6]2+ (aq) + 2 NO2 (g)

Explanation:

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