Chemical tests

• What colour is produced by lithium in a flame test ?

  Crimson red
• What colour is produced by sodium in a flame test

  Yellow
• What colour is produced by a potassium flame test ?

  Lilac
• What colour is produced by a calcium flame test?

  Orange red
• What colour is produced by a copper flame test?

  Green
• What colour precipitate does aluminium form with sodium hydroxide

  White
• What colour precipitate does calcium form with sodium hydroxide

  White
• What colour precipitate does copper form with sodium hydroxide ?

  Blue
• What colour precipitate does iron (11) form with sodium hydroxide ?

  Pale green
• What colour precipitate does iron(111) form with sodium hydroxide

  Orange-brown
• what colour precipitate does magnesium form with sodium hydroxide ?

  White
• What is the chemical test for carbon dioxide ?

  React the compound with a dilute acid.Bubble the gas produced through lime water

  Positive result: carbon dioxide turns the lime water cloudy
• What is the chemical test for Halide ions

  Add silver nitrate in the presence of dilute nitric acid

  Positive result: a silver halide precipitate is formed

  Silver chloride -white

  Silver bromide -cream

  Silver iodide - yellow
• What is the chemical test for sulphate ions ?

  Add barium chloride in the presence of dilute hydrochloric acid

  Positive result: a white precipitate is produced