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Chemical Tests ((Dangers of the Gases:, CO2 - Poisonous, O2 - in high…
Chemical Tests
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Test for the gases
Hydrogen (H2) - Squeaky pop test: Put HCl and Mg in a test tube and hold the top then light a splint and put in the test tube and it should pop.
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Oxygen (O2) - Light a splint, blow it out and while still glowy put it in oxygen and it should re ignite if oxygen is present.
Ammonia (NH3) - Insert damp red litmus paper and if it turns blue, ammonia is present (because it’s and alkali)
Chlorine (Cl2) - Insert damp UI paper into the gas. If the paper turns red then bleaches, chlorine is present
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Testing for carbonate anions
Metal carbonates, which contain CO32- ions, are identified by the addition of a few drops of dilute hydrochloric acid. A colourless gas is given off as the carbonate ions react with the hydrogen ions.
Testing for halide anions
(Chlorine, Bromine and Iodine). They are detected by adding nitric acid and then silver nitrate solution. If halides are present, a precipitate will form (silver halides)
Test for anhydrous copper(II) sulfate
Get a plastic tray and scoop anhydrous copper sulphate into it then put 1 drop at a time of water, you will observe the white anhydrous copper sulphate turn into hydrated copper sulphate crystals. The crystals will release heat because it is a reverse process. If heat is used to evaporate water then water has to be released.
Sodium Iodide: A flame test gives a yellow flame after adding Nitric acid followed by a silver nitrate, a yellow precipitate is made
Hydrochloric acid is added when you are testing for a sulphate because The acid reacts with any carbonate ions in a solution and gets rid of carbonates ion in the solution.
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