1[Cu(H2O)6] / Cu2+
in aqueous solution
pale blue
2[Cu(H2O)6] / Cu2+
+ OH- / NH3
Cu(OH)2(H2O)4
pale blue precipitate
3Cu(OH)2(H2O)4
+ excess OH-
insoluble
4Cu(OH)2(H2O)4
+ excess NH3
dark blue solution
5[Fe(H2O)6]2+ / Fe2+
pale green
6[Fe(H2O)6]2+ / Fe2+
+ OH- / NH3
Fe(OH)2(H2O)4
dirty green precipitate
7Fe(OH)2(H2O)4
+ excess OH-
insoluble
8Fe(OH)2(H2O)4
+ excess NH3
insoluble
9[Fe(H2O)6]3+ / Fe3+
yellow
10[Fe(H2O)6]3+ / Fe3+
+ OH- / NH3
Fe(OH)2(H2O)4
browny-red
11Fe(OH)2(H2O)4
+ excess OH-
insoluble
12Fe(OH)2(H2O)4
+ excess NH3
insoluble
13[Co(H2O)6]2+ / Co2+
pale pink
14[Co(H2O)6]2+ / Co2+
+ OH- / NH3
Cu(OH)2(H2O)4
blue precipitate
turns brown after a while
15Cu(OH)2(H2O)4
+ excess OH-
insoluble
16Cu(OH)2(H2O)4
+ excess NH3
Co(NH3)6 2+
pale brown solution that darkens over time
17[Cr(H2O)6]3+ / Cr3+
green
18[Cr(H2O)6]3+ / Cr3+
+ OH-
Cr(H2O)3(OH)3
green precipitate
19[Cr(H2O)6]3+ / Cr3+
+NH3
Cr(H2O)3(NH3)3
green gray precipitate
20Cr(H2O)3(OH)3
+ excess OH-
dark green solution
21Cr(H2O)3(NH3)
+ excess NH3
purple solution