5.3 - transition element colours Flashcards
1
Q
Fe2+
A
green
2
Q
Fe(OH)2
A
green pecipitate
3
Q
Fe3+
A
yellow
4
Q
Fe(OH)3
A
orange-brown precipitate
5
Q
Cu
A
brown
6
Q
Cu+
A
colourless
7
Q
CuI
A
white precipitate
8
Q
Cu2+
A
pale blue
9
Q
[Cu(NH3)4(H20)2]2+
A
deep blue
10
Q
Cu(OH)2
A
pale blue precipitate
11
Q
[CuCl4]2-
A
yellow
12
Q
Cr3+
A
violet
13
Q
[Cr(NH3)6]3+
A
purple
14
Q
Cr(OH)3
A
green precipitate
15
Q
[Cr(OH)6]3-
A
green
16
Q
Cr2O72-
A
orange
17
Q
CrO42-
A
yellow
18
Q
Mn2+
A
pale pink
19
Q
Mn(OH)2
A
light brown
20
Q
MnO4-
A
purple
21
Q
[Cu(H2O)6]2+ + 4Cl- (reagent: conc HCl)
A
[CuCl4]2- +6H2O
22
Q
[Cu(H2O)6]2+ + 4NH3 (reagent: excess NH3)
A
[Cu(NH3)4(H2O)2]2+ + 4H20
23
Q
[Cr(H20)6]3+ + 6NH3 (reagent: excess NH3)
A
6H20 +[Cr(NH3)6]3+
24
Q
notes on precipitation reactions:
Cu(OH)2
A
Redissolves in excess NH3 to give deep blue [Cu(NH3)4(H2O)2]2+
25
notes on precipitation reactions:
Cr(OH)3, excess NH3
purple [Cr(NH3)6]3+
26
notes on precipitation reactions:
Cr(OH)3, excess OH-
green [Cr(OH)6]3-
