Transition metal ion colours with NaOH Flashcards
1
Q
Cu 2+
A
- Blue solution > Blue precipitate
- Insoluble in excess NaOH
2
Q
Fe 2+
A
- pale green solution > green precipitate
- insoluble in excess NaOH
- precipitate turns brown when exposed to air
3
Q
Fe 3+
A
- pale yellow solution > orange-brown precipitate
- insoluble in excess NaOH
4
Q
Mn 2+
A
- pale pink solution > light brown precipitate
- insoluble in excess NaOH
- precipitate darkens when exposed to air
5
Q
Cr 3+
A
- violet solution > grey-green precipitate
- soluble in excess NaOH, forms dark green solution
