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Chemistry : Analysis (Flame Tests (Green flame = Barium Compounds, Lilac…
Chemistry : Analysis
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Precipitates
Aluminium, calcium and magnesium ions form white precipitates with sodium hydroxide solution
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Halide ions in solution produce precipitates with silver nitrate solution in the presence of dilute nitric acid
Sulfate ions in solution produce a white precipitate with barium chloride solution in the presence of dilute hydrochloric acid
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Other
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Chromatography
used to separate mixtures of inks, dyes and colouring agents in food
mixture is placed near the bottom of a piece of chromatography paper and is then placed upright in water. Mixture is carried up the paper at different rates, separating it.
Mass spectrometry
allow substances in a sample to be separated, then identified very quickly and accurately
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1.dissolved in a solvent 2.unreactive gas through the column 3.different substances at different speeds = seperation 4. leave one by one and are detected by the MS