Module 3 Qualitative analysis Flashcards
1
Q
What are anions also known as?
A
Negative ions.
2
Q
What are the observations for a positive test of carbonate ions, Co3 2-?
A
Fizzing and limewater turns cloudy.
3
Q
How can you test for sulphate ions?
A
Adding dilute hydrochloric acid and barium chloride to the sample.
4
Q
A
5
Q
A
6
Q
A
7
Q
A
8
Q
What are observations for a positive test of sulphate ions>
A
White precipitate of barium sulfate is produced.
9
Q
What do you use to test for halide ions?
A
Acidified AgNO3.
10
Q
How can you test for a a halide ion?
A
- Dissolve the sample in water
- Add aqueous silver nitrate
- Record the colour change
- If difficult to distinguish the colour, add aqueous ammonia, first dilute ammonia then concentrated ammonia.
- Note the solubility of precipitate.
10
Q
What are cations also known as?
A
Positive ions.
11
Q
What are observations for positive ammonium ions test?
A
- Red litmus paper turns blue
- Ammonia has a pungent smell
