Tests for Ions And Gases Flashcards
What is the test for a carbonate?
Add acid so it fizzes because of the carbon dioxide released
What is the test for a sulphate?
Add barium chloride so it forms a precipitate
What is the test for an iodide?
Add silver nitrate to make a yellow precipitate
What is the test for an bromide?
Add silver nitrate to make a cream precipitate
What is the test for an chloride?
Add silver nitrate to make a white precipitate
What sequence of events do you have to do the tests in?
Carbonate then sulphate then halides
What happens when a carbonate or sulphate is added to silver nitrate?
They create a false positive because they form a precipitate to make it look like there is a halide
Why isn’t the sulphate test done before the carbonate test?
Adding the carbonate to the barium chloride makes a false positive by making a white precipitate
What happens to a chloride in dilute and concentrated NH3?
It dissolves in dilute NH3
What happens to a iodide in dilute and concentrated NH3?
Nothing
What happens to a bromide in dilute and concentrated NH3?
It dissolves in concentrated NH3
What is the test for oxygen?
It relights a glowing splint
What is the test for carbon dioxide?
It makes limewater go cloudy
What is the test for hydrogen?
A lit splint goes pop
What is the test for chlorine?
It bleached damp blue litmus paper white
