Chemistry GCSE

Identifying Ions Using Flames

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  • Created by: Palvi
  • Created on: 15-05-11 15:47

Flame Tests

Sodium - Turns Yellow

Potassium - Turns Lilac

Calcium - Turns Brick Red

Copper - Turns Blue/Green

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Test For Metal Ions

Sodium Hydroxide is added to a solution of an ionic substance.If the ionic substance contains metal ions then the following precipitates will be made: 

Sodium Hydroxide solution + Copper (II) ions = Blue Precipitate 

Sodium Hydroxide solution + Iron (II) Ions = Green Precipitate

Sodium Hydroxide solution + Iron (III) Ions = Brown Precipitate

Sodium Hydroxide solution + Aluminium Ions = White Precipitate

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Test For Halide (Non-Metal) Ions

Dilute Nitric acid and silver nitarte solution are added to a solution of an ionic substance.If the ionic substance contains halide ions (i.e Chloride,Bromide or Iodide) the following coloured precipitates will be made: 

Silver Nitrate solution + Chloride ions = White Precipitate 

Silver Nitrate solution + Bromide ions = Pale Yellow Precipitate 

Silver Nitrate solution + Iodide ions = Yellow Precipitate 

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