Colours of inorganic ions and complexes Flashcards
1
Q
[Cu(H2O)6] 2+
A
pale blue
Cu2+ dissolved in water
2
Q
[Cu(H2O)4(OH)2] (s)
A
pale blue precip
NH3 dropwise to Cu2+
3
Q
[Cu(NH3)4(H2O)2] 2+
A
deep/dark blue
excess NH3 to Cu2+
4
Q
CuCl4 2-
A
yellow
excess HCl to Cu2+
5
Q
Cu+
A
white precip (CuI)
brown solution (I2)
reduction of Cu2+ with I-
6
Q
Cu2+/Cu
A
blue sol (CuSO4)
brown solid (Cu)
Cu2+ disproportionation
7
Q
CoCl4 2-
A
blue
Co2+ (aq) and excess HCl
8
Q
[Cr(H2O)6] 3+
A
pale purple
(heat –> green)
Cr3+ dissolved in water
9
Q
Cr(OH)3 (s)
A
dark green precip
NH3 dropwise into Cr3+
10
Q
[Cr(NH3)6] 3+
A
purple
excess NH3 to Cr3+
11
Q
[Cr(OH)6] 3-
A
dark green
excess OH- to Cr(OH)3
12
Q
Cr2O7 2-
A
orange
dissolved and acidified K2Cr2O7 (s)
13
Q
Cr3+
A
green
oxidised Cr2O7
14
Q
CrO4 2-
A
yellow
Cr3+ with hot alkaline H2O2
15
Q
[Mn(H2O)6] 2+
A
pale pink
Mn2+ dissolved in water
