I had to fill out this flow chart for qualitative analysis fopr acidic sulfides

Question

I had to fill out this flow chart for qualitative analysis fopr acidic sulfides shown below and now i need the reactions and i am a bit stuck. The dots next to the sulfides indicate how many reactions i need figured out.

Mercury (II) sulfide is the most insoluble sulfide. Bismuth, cadmium, and copper cations dissolve more readily.

Reactions:

Bi3+

?

?

?

?

Cd2+

?

?

?

?

Cu2+

?

?

?

?

Hg2+

?

?

?

I had to fill out this flow chart for qualitative analysis fopr acidic sulfides shown below and now i need the reactions and i am a bit stuck. The dots next to the sulfides indicate how many reactions i need figured out. Mercury (II) sulfide is the most insoluble sulfide. Bismuth, cadmium, and copper cations dissolve more readily. Reactions: Bi^3+ ? ? ? ? Cd^2+ ? ? ? ? Cu^2+ ? ? ? ? Hg^2+ ? ? ? C

Explanation / Answer

Bi +3

2Bi+3 + 3Na2S --> Bi2S3(s) + 6Na+ (Bi2S3 is brown)
Bi2S3 (s) + 6NO3-(aq) + 12H+ (aq) --> 2Bi3+(aq) + 3S(s) + 6NO2 (g) + 6H2O
Bi3+ + 3NH3 + 3H2O --> Bi(OH)3 (s) + 3NH+
2Bi(OH)3(s) + 3Sn(OH)42-(aq) <==> 2Bi(s) + 3Sn(OH)62-(aq)

Cu+2

Cu+2 + Na2S --> CuS(s) + 2Na+ (CuS is black)
CuS(s) + 2NO3-(aq) + 4H+(aq) --> Cu2+ (aq) + S(s) + 2NO2 (g) + 2H2O
Cu2+ + 4NH3 --> Cu(NH3)2+4       (Cu(NH3)2+4 is deep blue)
Cu2+(aq) + 2OH-(aq) <==> Cu(OH)2(s)

Hg+2

Hg2+ + H2S --> HgS (black) + 2H+ + 2Cl-
3HgS + 2NO3- + 6Cl- + 8H+ --> 3HgCl2 (aq) + 2NO + 3S + 4H2O
Hg22+(aq) + 2OH-(aq) --> Hg(l) + HgO(aq) + H2O(l)

Cd+2
Cd2+ + H2S --> CdS (yellow) + 2H+
3CdS(s) + 8H+(aq) + 2NO3-(aq) <==> 3Cd2+(aq) + 2NO(g) + 4H2O(l) + 3S(s)
Cd2+(aq) + 2NH3(aq) + 2H2O(l) <==> Cd(OH)2(s) + 2NH4+(aq)
Cd(OH)2(s) + 4NH3(aq) <==> [Cd(NH3)4]2+(aq) + 2OH-(aq)

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