Tests for Ions
- Created by: Emma
- Created on: 10-03-17 10:42
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- Tests for Ions
- Carbonates
- Carbonates react with acids to form carbon dioxide gas.
- Add a dilute acid e.g Hydrochloric acid
- Sulphates
- Add Hydrochloric acid and Barium Nitrate
- A dense white precipitate forms when Ba2+ ions are added to a solution containing sulphate ions.
- Barium Sulphate is insoluble
- Halides
- Add Silver Nitrate
- Silver Bromide (AgBr) is a cream precipitate.
- AgBr only dissolves in concentrated Ammonia.
- Silver Chloride (AgCl) is a white precipitate
- AgCl dissolves in both dilute and concentrated Ammonia.
- Silver Iodide (AgI) is a yellow precipitate.
- AgI does not dissove in concentrated or dilute Ammonia.
- Ammonium Compounds
- Add warm Sodium Hydroxide
- Damp piece of red litmus paper
- If Ammonia ions are presents, litmus paper turns blue
- Litmus paper is damp in order for the Ammonia gas to dissolve.
- Carbonates
- Bubble gas through lime water
- Carbonates
- Carbonates react with acids to form carbon dioxide gas.
- Add a dilute acid e.g Hydrochloric acid
- A saturated aqueous solution of Calcium Hydroxide
- Carbonates
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