Complex/Inorganic Ion Colours Flashcards
1
Q
[Cu(H2O)6]2+
from CuSO4.5H2O(s)
A
pale blue
2
Q
Cu(OH)2(s)
NH3 dropwise to Cu2+(aq)
A
pale blue precipitate
3
Q
[Cu(NH3)4(H2O)2]2+
excess NH3 to Cu2+(aq)
A
dark blue
4
Q
CuCl42–
excess HCl to Cu2+(aq)
A
yellow
5
Q
Cu+
reduction of Cu2+ with I–
A
white precipitate (cu) and brown solution (I)
6
Q
Cu2+ / Cu
Disproportionation of Cu+
A
brown solid (Cu) and blue solution (CuSO4)
7
Q
CoCl42–
from CoCl2.6H2O(s) plus water and excess HCl
A
blue
8
Q
Cr(H2O)6]3+ from KCr(SO4 )2.12H2O(s)
A
pale purple
green when heated
impurities - could appear green
9
Q
Cr(OH)3(s)
NH3 dropwise to Cr 3+(aq)
A
dark green precipitate
10
Q
[Cr(NH3)6]3+
excess NH3 to Cr 2+(aq)
A
purple
11
Q
[Cr(OH)6]3–
excess OH– to Cr(OH)3(s)
A
dark green
12
Q
Cr2O72– from K2Cr2O7(s) in 0.1mol dm-3 H2SO4
A
orange
13
Q
CrO42–
oxidation of Cr3+ with hot alkaline H2O2
A
yellow
14
Q
[Mn(H2O)6]2+
from MnSO4.4H2O(s)
A
pale pink
15
Q
Mn(OH)2(s)
NaOH dropwise to Mn2+(aq)
A
pale brown precipitate
