tests for... Flashcards
How to test for sulphate ions?
dilute HCl
Barium ions
Ba 2+ (aq) + SO4 2-(aq) -> BaSO4
white precipitates form
How to test for carbonates?
Calcium hydroxide Ca(OH)2 aka limewater
reacts and form CaCO3
white precipitate
Why is HCl added before sulfate test?
To remove any carbonate ions to create false positive results
How to test for ammonium? NH4+
add sodium hydroxide to form ammonia gas and water, that turns red litmus paper blue
NH4+ + OH- -> NH3 + H2O
How to test for water
anhydrous copper(II) sulfate
white to blue
what state is smoke?
solid!!!!!!!!!!!!
what state are fumes?
gas!!
Why is HCl used in flame tests?
solid salt is converted into more volatile metal chlorides
Why is HCl used in tests for sulfates?
Remove carbonate ions
What is calcium chloride used for?
Drying agent, soaks up water
Anhydrous
