Question

Slow addition of small amount of aqueous 2M NH3 to aqueous solution of Ni(NO3)2 (compound 1)...

Slow addition of small amount of aqueous 2M NH3 to aqueous solution of Ni(NO3)2 (compound 1) yield a green precipitate (compound 2) which dissolved (compound 3) upon continued addition. Identify:

A.

Ni2+   
B.

Ni(NO3)2
C.

NiO
D.

[Ni(H2O)6] 2+
E.

[Ni(H2O)4(OH)2]
F.

[Ni(OH)4]2–
G.

[Ni(NH3)6]2+

Choose from A-G:

compound 1 (    )                               

compound 2 (    )

compound 3   (    )
.
.
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Homework Answers

Answer #1

From the given information we will write the following equations:

2NH3(aq) + Ni(NO3)2(aq) + 2H2O(l) → Ni(OH)2(s) + 2NH4+(aq)

                   Compound1                  compound 2(green)

Ni(OH)2(s) + 6NH3(aq) → Ni(NH3)6]2+(aq) + 2OH-(aq)

                                      Compound 3

Compound 1: Ni(NO3)2

Compound 2: Ni(OH)2

Compound 3: Ni(NH3)6]2+

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