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Miss Corbett
Ion Tests for GCSE Chemistry
| Ion | Test | Result |
|---|---|---|
| Lithium ions | Flame test (nichrome wire / concentrated HCl) | Red flame |
| Sodium ions | Flame test (nichrome wire / concentrated HCl) | Yellow / Orange Flame |
| Potassium ions | Flame test (nichrome wire / concentrated HCl) | Lilac flame |
| Calcium ions | Flame test (nichrome wire / concentrated HCl) | Brick red |
| Barium ions | Flame test (nichrome wire / concentrated HCl) | Light green |
| Copper ions | Flame test (nichrome wire / concentrated HCl) | Blue / green |
| Aluminium ions | Precipitate in sodium hydroxide solution | White precipitate |
| Calcium ions | Precipitate in sodium hydroxide solution | White precipitate |
| Magnesium ions | Precipitate in sodium hydroxide solution | White precipitate |
| Copper ions | Precipitate in sodium hydroxide solution | Blue precipitate |
| Iron (II) ions | Precipitate in sodium hydroxide solution | Green precipitate |
| Iron (III) ions | Precipitate in sodium hydroxide solution | Brown (rust) precipitate |
| Carbonate ions | Add HCl, identify gas produced | Gas turns lime water cloudy (carbon dioxide) |
| Sulphite ions | Add HCl, identify gas produced | Gas turns acidified potassium dichromate (VI) orange > green |
| Sulphate ions | Add HCl and barium chloride | White precipitate |
| Bromide ions | Add dilute nitric acid and silver nitrate | Cream precipitate |
| Chloride ions | Add dilute nitric acid and silver nitrate | White precipitate |
| Iodide ions | Add dilute nitric acid and silver nitrate | Yellow precipitate |
| Nitrate ions | Add sodium hydroxide and aluminium powder | Ammonia gas produced (forms white smoke in presence of hydrogen chloride gas) |