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Tests for Anions
Tests for Anions in Solution
Question | Answer |
---|---|
Reagents used to test for Chlorides. Positive test? | Add silver nitrate. White precipitate appears. Dissolves in dilute ammonia. |
Reagents used to test for Sulphites and Sulphate. Positive test? | Add Barium Chloride to both samples. White precipitate formed if Sulphite/ Sulpharte present. |
Distinguishing test between Sulphites and Sulphates | Add dilute HCl. White precipitate dissolves in Sulphite. Not in Sulphate |
Reagents used to test for Carbonates and Hydrogen Carbonates. Positive test? | Add dilute HCl to both samples. Effervescence occurs. Bubble gases produced through Limewater. Limewater going cloudy indicates Carbon Dioxide. |
Distinguishing test between Carbonates and Hydrogen Carbonates? | Add Magnesium Sulphate. White precipitate appears in Carbonate, does not in Hydrogen Carbonate. |
Reagents used to test for Nitrates. Positive test? | Add Iron Sulphate and slowly drop in concentrated Sulphuric Acid. Brown ring appears. |
Reagents used to test for Phosphates. Positive test? | Add Ammonium Molybdate and slowly drop in concentrated Nitric Acid. Heat in a water bath. Yellow precipitate occurs. |
Evidence of a chemical reaction | 1: Temperature increase/decrease 2: Colour change 3: Effervescence 4: Light given off 5: Sound given off |
Law of Conservation of Matter | In any chemical reaction, matter is neither created or destroyed. It is merely changed from one form to the next. |
Law of Conservation of Mass | The total mass of the products of a chemical reaction is the same as the total mass of the reactants. |