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
What is the flame test for potassium?
Lilac
What is the flame test for calcium?
Orange
What is the flame test for sodium?
Yellow
What is the flame test for copper?
Green
What is the flame test for lithium?
Crimson
What is the flame test for strontium?
Red
What is the flame test for barium?
Apple green
