Ligands and Colours Flashcards
What colour is [Fe(H2O)6] 2+
Pale Green
What colour is [Fe(H2O)6)] 3+
Pale yellow
What colour is [Cu(H2O)6] 2+
Blue
What colour is [Cr(H2O)6] 3+
Dark Green
What colour is [Co(H2O)6] 2+
Pink
What colour is [CuCl4] 2-
- Yellow / Green
What colour is [CoCl4] 2-
Blue
What happens when you add Ammonia to [Cu(H2O)6] 2+
- Colour change from Blue to Royal blue
- Forms [Cu(NH3)^4 (H2O)^2] 3+
How many different isomers are there for [Cu(NH3)^4 (H2O)^2] 2+ and what are they
- 2 Isomers
- Cis and Trans
- Cis where 2 H2O are next to each other
- Trans where they are across
- Trans is more likely
Reaction between Conc. HCl and [Co(H2O)6] 2+
- [CoCl4] 2-
Reaction between Conc. HCl and [Cu(H2O)6] 2+
- [CuCl4] 2-
Is ligand exchange and equilibrium process
- Yes
- Therefore a reversable reaction
- For instance the reaction of hydrataded copper(II) and NH3
- Excess NH3 drives it towards the deeper royal blue
- Water drives towards the paler hydride
[Cr(H2O)6)] 3+ and some OH(-)
- Grey Green precipitate
- [Cr(H2O)3(OH)3]
[Fe(H2O)6] 2+ and some OH(-)
- Dark green precipitate
- [Fe(H2O)4(OH)2]
[Cu(H2O)6] 2+ and some OH(-)
- Pale blue precipitate
- [Cu(H2O)4(OH)2]
[Cr(H2O)6)] 3+ and excess OH(-)
- [Cr(H2O)3(OH)3] redissolves
- Leaving deep green solution
[Fe(H2O)6] 2+ and excess OH(-)
- No further reaction
- Some red/brown at the surface upon reaction with the air
[Fe(H2O)6] 3+ and some OH(-)
- Red - Brown precipitate
- [Fe(H2O)3(OH)3]
[Fe(H2O)6] 3+ and excess OH(-)
No Further
[Cu(H2O)6] 2+ and excess OH(-)
No reaction
