Tests for ions

• What happens when you react cl- ions with the halogens?

  No reaction occurs
• What happens when you react Br- with the halogens?

  will displace chlorine but not iodine, it's reaction with chlorine will form a cream colour from the formation of bromine
• What happens when Iodine ions react with halogens?

  It reacts with Chlorine and Bromine to form a violet colour
• What is the carbonate test?

  It is where you react the compound with any acid and bubble it through the delivery tube, into limewater, if carbonate ions are present then it will go cloudy
• What is the test for sulfate ions?

  It is done by reacting barium chloride and into the aqueous mixture and if present it will form a white precipitate
• How do you test for halides?


  Add an aqueous solution of silver nitrate to your solution, if halide ions are present then a precipitate of differing colours will form
• What colour will each precipitate form?

  Cl- ions will form a white precipitate, Br- ions will form a cream precipitate, I- ions will form a yellow precipitate
• You know the compound has halide ions, what happens if you add NH3 ?

  If it is chloride then it will be soluble in dilute NH3, If it is bromide it will still be solouble but in a higher conc of NH3, It wont be soluble in iodide
• What is the test for NH4+ ions?


  add aqueous NaOH, you should then hold damp litmus paper over the test tube, if it is present then then it will turn it blue
• Test for group 2 metals?


  Add solutions to two different test tubes, then add KrCrO4 to one and add H2 SO4 to the other. Mg=soluble in both, Sr=soluble in chromate, Ba=Insoluble in both