Testing for ions Flashcards
When Li+ is burnt what colour is produced?
Crimson
When Na+ is burnt what colour is produced?
Yellow
When K+ is burnt what colour is produced?
Lilac
When Ca2+ is burnt what colour is produced?
Red
When Ba2+ is burnt what colour is produced?
Green
When a few drops of sodium hydroxide solution is added to Ca2+ what colour does the solution appear to be?
White
When a few drops of sodium hydroxide solution is added to Cu2+ what colour does the solution appear to be?
Blue
When a few drops of sodium hydroxide solution is added to Fe(II)2+ what colour does the solution appear to be?
Green
When a few drops of sodium hydroxide solution is added to Fe(III)3+ what colour does the solution appear to be?
Brown
When a few drops of sodium hydroxide solution is added to Al3+ what colour does the solution appear to be?
Initially white but then it reacts with more hydroxide to appear colourless.
When a few drops of sodium hydroxide solution is added to Mg2+ what colour does the solution appear to be?
White
How do we test for carbonates?
We add acid and bubble the gas produced through limewater. If it turns cloudy then carbonates are present. This is because acid + carbonate -> salt + water + carbon dioxide
If we add dilute nitric acid followed by a silver nitrate solution to an unknown solution and a white precipitate is formed, what ion is present?
Cl-
If we add dilute nitric acid followed by a silver nitrate solution to an unknown solution and a cream precipitate is formed, what ion is present?
Br-
If we add dilute nitric acid followed by a silver nitrate solution to an unknown solution and a yellow precipitate is formed, what ion is present?
I-
How do we test for a sulfate?
We add dilute HCl followed by barium chloride solution. If a white precipitate is formed the original compound was a sulfate.
