Qualatative analysis Flashcards
What is the carbonate test?
add dilute nitric acid
if bubbles form - carbonate could be present
bubble with limewater to confirm presence
What is the sulfate test?
add equal volume of aq barium nitrate
colourless —> white precipitate
How do you test for a halide?
add silver nitrate
How do you test for ammonium ion?
warm with dilute sodium hydroxide and test for gas given off with damp red litmus paper
What is the + result for testing for ammonium ions? and why?
red litmus paper turns blue
NH3 + H2O —> NH4OH
alkaline produced
What is the false positive test with BaCL2 and testing for sultfates?
BaCO3 also produces a white precipitate
What is the false positive result of a halide test using AgNO3?
Ag2CO3 and Ag2SO4 also produce white precipitates so not AgCl
What order should you carry out the tests for anions?
carbonate test (HNO3) > sulfate test (BaCl2) > halide test (AgNO3)
