Transition Metal Ion Colours + Precipitation Reactions:
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27 Terms
Ti3+(aq)
purple
V2+(aq)
mauve
Cr3+(aq)
green
Mn2+(aq)
very pale pink
Fe2+(aq)
green
Co2+(aq)
pink
Ni2+(aq)
green
Cu2+(aq)
blue
V3+(aq)
green
VO2+(aq)
blue
VO2+(aq)
yellow
Cr2O72-
orange
MnO4-
purple
Fe3+(aq)
yellow / brown
Cu2+ + dropwise OH- →
[Cu(H2O)6]2+ + 2OH- → [Cu(H2O)4(OH)2](s) + 2H2O(l)
pale blue solution pale blue precipitate
Fe2+ + dropwise OH- →
[Fe(H2O)6]2+ + 2OH- → [Fe(H2O)4(OH)2](s) + 2H2O(l)
pale green solution dark green precipitate
Mn2+ + dropwise OH- →
[Mn(H2O)6]2+(aq) + 2OH- → [Mn(H2O)4(OH)2](s) + 2H2O(l)
pale pink solution pale brown precipitate
Cr3+ + dropwise OH- →
[Cr(H2O)6]3+ + 3OH- → [Cr(H2O)3(OH)3](s) + 3H2O(l)
Pale purple solution Dark green precipitate
Cr3+ + excess OH- →
[Cr(H2O)3(OH)3](s) + 3OH- (aq) → [Cr(OH)6]3-(aq) + 3H2O(l)
Pale purple solution Dark green solution
Fe3+ (aq) + dropwise OH- (aq) →
[Fe(H2O)6]3+(aq) + 3OH- → [Fe(H2O)3(OH)3](s) + 3H2O(l)
Yellow solution Orange-brown precipitate
Cu2+(aq) + dropwise NH3(aq) →
[Cu(H2O)6]2+(aq) + 2NH3(aq) → [Cu(H2O)4(OH)2](s) + 2NH4+(aq)
Pale blue solution Pale blue precipitate
Cu2+ + excess NH3 →
[Cu(H2O)6]2+(aq) + 4NH3(aq) → [Cu(NH3)4(H2O)2]2+(aq) + 2H2O(l) + 2OH-(aq)
pale blue solution dark blue solution
Fe2+(aq) + dropwise NH3(aq) →
[Fe(H2O)6]2+ + 2NH3(aq) → [Fe(H2O)4(OH)2](s) + 2NH4+(aq)
Pale green solution Dark green precipitate
Mn2+(aq) + dropwise NH3
[Mn(H2O)6]2+ + 2NH3(aq) → [Mn(H2O)4(OH)2](s) + 2NH4+(aq)
Pale pink solution pale brown precipitate
Cr3+(aq) + dropwise NH3 →
[Cr(H2O)6]3+ + 3NH3 → [Cr(H2O)3(OH)3](s) + 3NH4+(aq)
Pale purple solution Dark green precipitate
Cr3+ + excess NH3 →
[Cr(H2O)3(OH)3](s) + 6NH3(aq) → [Cr(NH3)6]3+(aq) + 3H2O + 3OH-
Pale purple solution purple solution
Fe3+ + dropwise NH3 →
[Fe(H2O)6]3+(aq) + 3NH3(aq) → [Fe(H2O)3(OH)3](s) + 3NH4+(aq)
Yellow solution orange-brown precipitate
