Help precipitate reagents and pH neutrality?

Question

I need help. I do not understand how to balance equations.

Write balanced equations for the following reactions.

a. The precipation of the five cations (Mn 2+, Ni2+, Fe3+, (and Fe2+), Al3+, and Zn 2+) in a sulfide solution with a pH near neutrality.

b. The dissolving of FeS, ZnS, MnS, and Al(OH)3 with a strong acid.

c. The reaction of the fice cations with an excess of strong base.

d. the reactions of Fe3+ and Ni3+ with NH3.

e. The reactions of Al3+ and Zn2+ with NH3.




If all you can do is just give hints it would be appreciated. I do not understand how to do this at all. Any help would be really appreciated

Answer 1

Mn2+ + S2- -> MnS
Ni2+ + S2- -> NiS
Fe3+ + S2- -> FeS + S

The rest will be complexes like [Al(NH3)3]3+