3.3 qualitative Flashcards
1
Q
test for carbonate ions
A
- add dilute nitric acid
- if present, bubbles of carbon dioxide formed
- indentified by limewater turning cloudy
2
Q
test for sulfate ions
A
- adding barium ions to give white ppt
- using barium chloride or barium nitrate
3
Q
test for ammonium ions
A
- adding hydroxide ions and heating solution
- positive = release ammonia which will turn damp red litmus paper blue
4
Q
sequence for tests
A
- carbonate ions
- sulfate ions
- halide ions
5
Q
why should the test for sulfate ions be carried out in acidified conditions?
A
to ensure the removal of carbonate ions
6
Q
why should the carbonate test be peformed before the sulfate test?
A
barium carbonate is a white ppt so all cabronate ions need to be removed before barium is added or it will be a false positive test