Topic 4- Flame Tests And Test For Ammonium Ions Flashcards
1
Q
Li+
A
Red
2
Q
Na+
A
Yellow / orange
3
Q
K+
A
Lilac
4
Q
Rb+
A
Red / purple
5
Q
Cs+
A
Blue / violet
6
Q
Be2+
A
No color
7
Q
Mg2+
A
No color
8
Q
Ca+
A
Brick red
9
Q
Sr2+
A
Crimson red
10
Q
Ba2+
A
Apple green
11
Q
What causes the colors?
A
When metals are heated, electrons gain energy to move to higher energy levels.
When they return to original energy levels they release energy in the form of light.
12
Q
How to test for ammonium ions?
A
Add NaOH and warm the mixture.
NH4 + OH- -> NH3 +H20
Damp litmus paper turns blue
