Qualitative Tests Flashcards
1
Q
CO2 Carbon Dioxide
A
Bubble gas produced through limewater - changes from colourless to milky
2
Q
H2 Hydrogen
A
Place a burning splint into contact with the gas. A pop is produced.
3
Q
O2 Oxygen
A
Place a glowing splint into contact with the gas. The splint relights.
4
Q
Cl2 Chlorine
A
Damp litmus paper turn red then bleaches.
5
Q
NH3 Ammonia
A
Glass rod dipped in concentrated HCl - white fumes and smoke.
6
Q
HCl Hydrochloride
A
Glass rod dipped in concentrated Ammonia solution - white fumes and smoke.
7
Q
SO2 sulfur dioxide
A
Bubble gas produced through potassium dichromate solution - changes from orange to green
8
Q
Flame Test Method
A
- Dip nichrome wire in conc. HCl then place in blue Bunsen flame.
- Repeat until no colour observed.
- Dip wire into sample then into flame.
- Record colour observed.
9
Q
Li+
A
crimson
10
Q
Na+
A
yellow
11
Q
K+
A
lilac
12
Q
Ca2+
A
brick red
13
Q
Ba2+
A
green
14
Q
Cu2+
A
blue-green
15
Q
Nh4+
A
- 5cm3 of NaOH solution in a test tube.
- Add spatula measure of sample.
- Warm gently.
- If NH4+ ion present, NH3 with a pungent smell will be evolved.
- Confirm with NH3 test.
