Testing ions You need to remember all of the results and tests for these ions! 3.5 / 5 based on 7 ratings ? ChemistryTesting and analysing substancesGCSE Created by: emilyanneCreated on: 22-05-11 17:53 Testing Positive Ions: FLAME TESTS - A flame test is where the substance is put under a bunsen burner, and the colour of the flame tell us of ions present. Lithium (Li+) : Crimson red flame Sodium (Na+): Yellow/ Orange flame Potassium (K+): Lilac Calcium (Ca2+): Brick red Barium (Ba2+): Green - You need to remember all of these 1 of 4 Testing Positive Ions: SODIUM HYDROXIDE - When sodium hydroxide is added, these ions form a different coloured precipitate. Aluminium: White precipitate Calcium: White precipitate Magnesium: White precipitate Copper (II): Light blue precipitate Iron (II): Green precipitate Iron (III): Red precipitate 2 of 4 Testing Negative Ions Testing for a carbonate: Add a WEAK ACID --> Salt, Water, Carbon Dioxide is formed Testing for sulfates: Add HYDROCHLORIC ACID --> White precipitate formed Testing for nitrates: Add SODIUM HYDROXIDE, then ALUMINIUM --> Ammonia given off 3 of 4 Testing Negative Ions Testing for halides: Add NITRIC ACID and SILVER NITRATE: Chloride ions: White precipitate formed Bromide ions: Cream precipitate formed Iodide ions: Yellow precipitate formed 4 of 4
Comments
No comments have yet been made