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Tests for Anions

Tests for Anions in Solution

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.
Created by: cbschemistry