Transition colours and formulas
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49 Terms
Cu 2+ aqueous ion colour
pale blue solution
Cu 2+ aqueous ion formula
[Cu(H2O)6]2+ (aq)
Cu 2+ with OH- colour
pale blue precipitate
Cu 2+ with OH- formula
Cu(H2O)4(OH)2 (s)
Cu 2+ with excess OH-
no change
Fe 2+ aqueous ion colour
pale green solution
Fe 2+ aqueous ion formula
[Fe(H2O)6]2+ (aq)
Fe 2+ with OH- colour
dark green precipitate
Fe 2+ with OH- formula
Fe(H2O)4(OH)2 (s)
Fe 2+ with excess OH-
no change
Mn 2+ aqueous ion colour
pale pink solution
Mn 2+ aqueous ion formula
[Mn(H2O)6]2+ (aq)
Mn 2+ with OH- colour
pale brown precipitate
Mn 2+ with OH- formula
Mn(H2O)4(OH)2 (s)
Mn 2+ with excess OH-
no change
Cr 3+ aqueous ion colour
pale pruple solution
Cr 3+ aqueous ion formula
[Cr(H2O)6]3+ (aq)
Cr 3+ with OH- colour
dark green precipitate
Cr 3+ with OH- formula
Cr(H2O)3(OH)3 (s)
Cr 3+ with excess OH- colour
dark green solution
Cr 3+ with excess OH- formula
[Cr(OH)6]3- (aq)
Fe 3+ aqueous ion colour
yellow solution
Fe 3+ aqueous ion formula
[Fe(H2O)6]3+ (aq)
Fe 3+ with OH- colour
orange brown precipitate
Fe 3+ with OH- formula
Fe(H2O)3(OH)3 (s)
Fe 3+ with excess OH- formula
no change
which is the only ion that changes when excess OH- is added
Cr 3+
goes from dark green precipitate to a dark green solution
Cu2+ with NH3 colour
pale blue precipitate
Cu2+ with NH3 formula
Cu(H2O)4(OH)2 (s)
Cu2+ with exces NH3 colour
dark blue solution
Cu2+ with exces NH3 formula
[Cu(NH3)4(H2O)2]2+ (aq)
Fe2+ with NH3 colour
dark green precipitate
Fe2+ with NH3 formula
Fe(H2O)4(OH)2 (s)
Fe2+ with excess NH3
no change
Mn2+ with NH3 colour
pale brown precipitate
Mn2+ with NH3 formula
Mn(H2O)4(OH)2 (s)
Mn2+ with excess NH3
no change
Cr3+ with NH3 colour
dark green precipitate
Cr3+ with NH3 formula
Cr(H2O)3(OH)3 (s)
Cr3+ with excess NH3 colour
pruple solution
Cr3+ with excess NH3 formula
[Cr(NH3)6]3+ (aq)
Fe3+ with NH3 colour
orange brown precipitate
Fe3+ with NH3 formula
Fe(H2O)3(OH)3 (s)
Fe3+ with excess NH3
no change
which are the only ions that change in excess of NH3
chromium and copper
Reduction of Cr3+ with Zn form
2 Cr3+ + Zn → 2Cr2+ + Zn2+
What colour is Cr2+
Pale blue
Oxidation of Cr2O72- with hydrogen peroxide
3H202 + 2Cr(OH)63- → 2OH- + 2CrO42- + 8H20
What colour is 2CrO42-
Yellow
