Chemistry - Colours of Inorganic Ions and Complexes
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Set to learn the definitions, not terms. All info is taken from the OCR resource, ' https://www.ocr.org.uk/Images/598991-colours-of-inorganic-ions-and-complexes-poster-.pdf '
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40 Terms
[Cu(H2O)6]2+
Pale blue, aq
[Cu(H2O)6]2+ is formed from:
CuSO4.5H2O
Cu(OH)2
Pale blue, s
Cu(OH)2 is formed from:
Ammonia added dropwise to Cu²+
[Cu(NH3)4(H2O)2]2+
dark blue, aq
[Cu(NH3)4(H2O)2]2+ is formed by:
Cu²+ with excess ammonia
CuCl42-
pale yellow aq
CuCl42- is formed by:
Excess HCl added to CU²+
Cu+
white s in brown I2
Cu+ is formed by:
Reaction of Cu2+ with I-
Cu2+/Cu
Blue aq w/ brown solid
Cu2+/Cu is formed by:
Disproportionation of Cu+ in acid
CoCl42-
blue, aq
CoCl42- is formed by:
CoCl2.6H2O plus water and HCl
[Cr(H2O)6]3+
pale purple, aq
[Cr(H2O)6]3+ is formed by:
KCr(SO4)2.12H2O plus water
Cr(OH)3
dark green, s
Cr(OH)3 is formed by:
ammonia added dropwise to Cr³+
[Cr(NH3)6]3+
purple, aq
[Cr(NH3)6]3+ is formed by:
excess ammonia added to Cr²+
[Cr(OH)6]3-
dark green, aq
[Cr(OH)6]3- is formed by:
Excess OH- added to Cr(OH)3
Cr2O72-
orange, aq
Cr2O72- is formed by:
K2Cr2O7 in H2SO4
CrO42-
yellow, aq
CrO42- is formed by:
Oxidation of Cr³+ with hot alkaline H2O2
[Mn(H2O)6]2+
pale pink, aq
[Mn(H2O)6]2+ is formed by:
MnSO4.4H2O
Mn(OH)2
pale brown, s
Mn(OH)2 is formed by:
NaOH added dropwise to Mn²+
[Fe(H2O)6]2+
pale green, aq
[Fe(H2O)6]2+ is formed by:
Na Oh added dropwise to Fe²+
Fe(OH)2
dark green, s
Fe(OH)2 is formed by:
NaOH added dropwise toFe²+
[Fe(H2O)6]3+
dark yellow, aq
[Fe(H2O)6]3+ is formed by:
FeCl.6H2O
Fe(OH)3
orange-brown, s
Fe(OH)3 is formed by:
NaOH added dropwise to Fe³+
MnO4-/Fe2+ —> Mn2+/Fe3+
purple to pale pink
I-/Fe3+ —> I2/Fe2+
orange-brown —>brown
Note 
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