C3 - Analysing Substances
- Created by: Chloe Matthews
- Created on: 27-03-14 20:01
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- C3 - Analysing Substances
- Flame tests are used to detect a particular metal ion in a compound.
- 1. Dip a clean flame test loop in the sample solution.
- 2. Hold the flame test loop at the edge of a Bunsen burner flame.
- 3. Observe the changed colour of the flame.
- Lithium - Crimson
- Sodium = Yellow
- Potassium = Lilac
- Calcium = Red
- Barium = Green
- Testing for carbonates.
- 1. Add a few drops of dilute hydrochloric acid to the solid.
- 2. If you notice fizzing, a gas is being produced.
- 3. Use limewater to test the gas. If it goes cloudy, carbon dioxide has been produced, and the substance is a carbonate.
- Testing for halide ions.
- 1. Dissolve a sample of the solid in dilute hydrochloric acid.
- 2. Add silver nitrate solution.
- Silver chloride is white.
- Silver bromide is cream.
- Silver iodide is yellow.
- Testing for sulfates.
- 1. Dissolve a sample of he solid in dilute hydrochloric acid.
- 2. Add barium chloride solution.
- 3. Sulfate compounds for a white precipitate.
- Flame tests are used to detect a particular metal ion in a compound.
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