C8. Test for Cations Flashcards
1
Q
Al 3+
A
NaOH 1. white precipitate 2. soluble in excess alkali giving a colourless solution NH3 1. white precipitate 2. insoluble in excess alkali
2
Q
NH4 +
A
NaOH
- no precipitate
- ammonia produced on warming
3
Q
Ca 2+
A
NaOH 1. no precipitate 2. insoluble in excess alkali NH3 1. no precipitate / very slight white precipitate
4
Q
Cr 3+
A
NaOH 1. green precipitate 2. soluble in excess alkali giving a green solution NH3 1. grey-green precipitate 2. insoluble in excess alkali
5
Q
Cu 2+
A
NaOH 1. light blue precipitate 2. insoluble in excess alkali NH3 1. light blue precipitate 2. soluble in excess alkali giving a dark blue solution
6
Q
Fe 2+
A
NaOH 1. green precipitate 2. insoluble in excess alkali NH3 1. green precipitate 2. insoluble in excess alkali
7
Q
Fe 3+
A
NaOH 1. red-brown precipitate 2. insoluble in excess alkali NH3 1. red-brown precipitate 2. insoluble in excess alkali
8
Q
Zn 2+
A
NaOH
1. white precipitate
2. soluble in excess alkali giving a colourless solution
NH3
1. white precipitate
2. soluble in excess alkali giving a colourless solution
