Cations RP Flashcards
1
Q
Method
A
Clean a platinum wire loop by dipping it in dilute HCl
Hold it under a blue flame until it burns colourless
Dip it into the sample and hold under the flame
2
Q
Li+
A
Crimson
3
Q
Na+
A
Yellow
4
Q
K+
A
Lilac
5
Q
Ca2+
A
Orange-red
6
Q
Cu2+
A
Green
7
Q
Sodium hydroxide method
A
Add a few drops of sodium hydroxide to a solution of the compound
8
Q
Ca2+ NaOH
A
White precipitate
9
Q
Cu2+ NaOH
A
Blue precipitate
10
Q
Fe2+ NaOH
A
Green precipitate
11
Q
Fe3+ NaOH
A
Brown precipitate
12
Q
Al3+ NaOH
A
White then redissolves to form colourless
13
Q
Mg2+ NaOH
A
White precipitate
