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[Cu(H2O)]2+
pale blue solution
Cu(OH)2
pale blue precipitate
[Cu(NH3)4(H2O)2]2+
dark blue solution
CuCl4 2-
yellow solution
reducing Cu2+ with I-
white precipitate (CuI) and brown solution (I2)
reaction of Cu+ and H2SO4
brown precipitate (Cu) blue solution (CuSO4)
CoCl4 2-
blue solution
[Cr(H2O)6]3+
pale purple, green when heated
Cr(OH)3
dark green precipitate
[Cr(NH3)6]3+
purple solution
[Cr(OH)6]3-
dark green solution
Cr2O72-
orange solution
CrO42-
yellow solution
[Mn(H2O)6]2+
pale pink solution
Mn(OH)2
pale brown precipitate
[Fe(H20)6]2+
pale green solution
Fe(OH)2
dark green precipitate
[Fe(H2O)6]3+
yellow solution
Fe(OH)3
orange-brown precipitate
MnO4-/Fe2+→Mn2+/Fe3+
Purple to pale pink (may be colourless in titration)
I-/Fe3+→I2/Fe2+
orange brown (Fe3+) to brown (I2)