Edexcel IAL Chemistry A2 17.7 coloured aqueous transition-metal ions
Edexcel IAL Chemistry A2 17.7 coloured aqueous transition-metal ions
Use the ion and its d-electron count: Ni2+, Cu2+, Cr3+, Fe2+ or vanadium complexes can be coloured, while d0 or d10 ions are common traps.
How this is tested
- Identify ions such as Ni2+ that form coloured transition-metal complexes.
- Use known colours or formulae to suggest cations responsible for green or blue solutions.