Ions Colour Flashcards
1
Q
Cu(H20)6 2+
A
pale blue
2
Q
Cu(OH)2 (s)
A
Nh3 dropwise to Cu2+ aq
Pale blue precipitate
3
Q
Cu(NH3)4 (H20)2 2+
A
Excess NH3 to Cu2+ aq
Dark blue
4
Q
CuCl4 2-
A
Excess HCl to Cu2+ aq
Yellow
5
Q
Cu+
A
reduction of Cu2+ with I-
White precipitate Cul and brown I2
6
Q
Cu2+ / Cu
A
Disproportionation of Cu+ brown solid Cu and blue solution CuSO4
7
Q
CoCl4 2-
A
from CoCl2 6H20 plus water and excess Hcl
blue
8
Q
Cr(H20)6 3+
A
Pale purple
Due to impurities common for CrIII to appear green in solution
9
Q
Cr(OH)3 (s)
A
NH3 dropwise to Cr3+ aq
Dark green precipitate
10
Q
Cr(NH3)6 3+
A
Nh3 to Cr3+ aq
Purple
11
Q
Cr2O7 2-
A
Orange
12
Q
Cr(OH)6 3-
A
excess OH- to CrOH3 (s)
Dark green
13
Q
CrO4 2-
A
Oxidation of Cr3+ with Hot alkaline h2o2
Yellow
14
Q
Mn(H2O)6 2+
A
Pale Pink
15
Q
Mn(OH)2 (s)
A
NaOh dropwise to Mn2+
Pale brown precipitate
