transition metals☹️ Flashcards
Cr3+ aqueous ion colour and formula
Violet solution
[Cr(H2O)6]3+
Fe2+ aqueous colour and formula
Green solution
[Fe(H2O)6]2+
Fe3+ aqueous colour and formula
Yellow solution
[Fe(H2O)6]3+
Mn2+ aqueous colour and formula
Pale pink solution
[Mn(H2O)6]2+
Cu2+ aqueous colour and formula
Blue solution
[Cu(H2O)6]2+
Cr3+ and NaOH
colour change and equation
initially
violet solution to green ppt
[Cr(H2O)6]3+ + 3OH- = Cr(OH)3(H2O)3
in excess
violet solution to green solution
[Cr(H2O)6]3+ + 6OH- = [Cr(OH)6]3-
Fe2+ and NaOH colour change and equation
green solution to green ppt
[Fe(H2O)6]2+ + 2OH- -> Fe(OH)2(H2O)4
Fe3+ and NaOH colour change and equation
yellow solution to brown ppt
[Fe(H2O)6]3+ +OH- -> Fe(OH)3(H2O)3
Mn2+ and NaOH colour change and equation
pale pink solution to pale brown ppt
[Mn(H2O)6]2+ + OH- -> Mn(OH)2(H2O)4
Cu2+ and NaOH colour change and equation
blue solution to blue ppt
[Cu(H2O)6]2+ + OH- -> Cu(OH)2(H2O)4
Cr3+ and NH3 colour change and equation
initially
violet solution to green ppt
[Cr(H2O)6]3+ +NH3 -> Cr(OH)3(H2O)3 + NH4+
in excess
to purple solution
[Cr(NH3)6]3+
Fe2+ and NH3 colour change and equation
green solution to green ppt
[Fe(H2O)6]2+ + NH3 -> Fe(OH)2(H2O)4 + NH4+
Fe3+ and NH3 colour change and equation
yellow solution to brown ppt
[Fe(H2O)6]3+ + NH3 -> Fe(OH)3(H2O)3
Mn2+ and NH3 colour change and equation
pale pink ppt to pale brown ppt
[Mn(H2O)6]2+ + NH3 -> Mn(OH)2(H2O)4
Cu2+ and NH3 colour change and equation
initially
blue solution to blue ppt
[Cu(H2O)6]2+ +NH3 -> Cu(OH)2(H2O)4
in excess
deep blue solution
[Cu(NH3)4(H2O)2]2+