Analysis Of Inorganic Compounds Flashcards
How to test for carbonate ions (CO3,2-)
Add a few drops of hydrochloric acid and bubble this through limewater(sodium hydroxide), carbonate present if limewater turns cloudy(sodium carbonate produced)
How do carbonates react with dilute acids
Produce CO2, H2O and corresponding salt
How to test for hydrogencarbonates (HCO3)
Add solution containing magnesium ions eg magnesium sulfate, carbonate will produce precipitate(magnesium carbonate) while hydrogencarbonate will not
How to test for sulfate ions (SO4,2-)
Add a few drops of hydrochloric acid to the solution and then a few drops of barium chloride, if sulfate ions present white precipitate of barium sulphate will form which is insoluble
Why add a few drops of hydrochloric acid before testing for sulphate ions
To get rid of any carbonates which would also produce a white precipitate
How to test for ammonium salts
Mix the unknown solution with warm, dilute sodium hydroxide which if ammonium salts present will produce ammonia which will turn damp red litmus paper blue
