transition metal ion colours Flashcards
what colour is V2+?
Violet
What colour is V3+?
Green
what colour is VO2+?
(2+ is the oxidation number)
green
VO2-
( minus is the oxidation number)
yellow
Cr3+
green
Cr2O7(2-)
orange
mno4(-2)
green
mno4(-)
purple
Fe3+
yellow
Co2+
pink
Ni2+
green
Fe2+
pale green
Cu2+
green
Ti2+
Violet
Ti3+
purple
Cu2+
(in aqueous solution)
[Cu(H2O)6]2+
Blue
Fe2+
(in aqueous solution)
[Fe(H2O)6]2+
pale green
Fe3+
( in aqueous solution)
[Fe(H2O)6]3+
green precipate
Mn2+
(in aqueous solution)
[Mn(H20)6]2+
pink
Cr3+
( in aqueous solution)
[Cr(H2O)6]3+
dark green
Cu2+
(add OH- or NH3 to aqueous solution)
[Cu(OH)2(H2O)4]2+
pale blue
Fe2+
(add OH- or NH3 to aqueous solution)
[Fe(OH)2(H2O)4]
green precipitate
Fe3+
(add OH- or NH3 to aqueous solution)
[Fe(OH)3(H2O)3)]3+
Orange
Mn2+
(add OH- or NH3 to aqueous solution)
[Mn(OH)2(H2O)4]2+
pink
Cr3+
(add OH- or NH3 to aqueous solution)
[Cr(OH)3(H2O)3]3+
green-grey
Cu2+, Fe2+, Fe3+, Mn2+
Insoluble in excess NaoH
Cr3+
(in excess Naoh)
[Cr(OH)6]3-
Dark yellow
Fe2+, Mn2+, Fe3+
insoluble in excess NH3
Cu2+
(add excess NH3)
[Cu(NH3)4(H2O)2]2+
dark blue
Cr3+
( in excess NH3)
[Cr(NH3)6]3+
purple
