PAG 4 - Qualitative analysis of ions Flashcards
1
Q
Describe the chemical test for halide ions
A
Add silver nitrate. Precipitate forms:
- White: AgCl (soluble in dilute ammonia)
- Cream: AgBr (soluble in concentrated ammonia)
- Yellow: AgI (insoluble in ammonia)
2
Q
How can SO4 2- ions be identified?
A
Add aqueous barium nitrate. A white precipitate (BaSO4) will form if sulfate ions are present. This precipitate is insoluble in excess dilute strong acids.
3
Q
Describe the chemical test used to
detect CO3 2- and HCO3- ions
A
- Add aqueous acid
- If either ion is present bubbles of CO2 will be released
- Test the gas by bubbling it through limewater via a
delivery tube. If it is CO2, the limewater will turn cloudy
4
Q
What are the solubilities of the first 3
group 2 metals (Mg, Sr, Ba) in sulfate
solution?
A
Mg - soluble
Sr - insoluble
Ba - insoluble
5
Q
What are the solubilities of the first 3
group 2 metals (Mg, Sr, Ba) in chromate
solution?
A
Mg - soluble
Sr - soluble
Ba - insoluble
