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Chemical Tests (Flame test(Cations) (2.Put the wire into a blue flame to…
Chemical Tests
Flame test(Cations)
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The colors should be: Lithium- Red, Sodium- Yellow, Calcium- Orange-red , Potassium- Lilac, Strontium- Red , Copper- Blue-green
Testing for Gases
Carbon dioxide
2.Bubble the gas into the limewater, the limewater should turn milky-white with the presence of CO2
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Hydrogen
2.Place it into a tube with the gas, a squeaky pop will be made if hydrogen is present
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Ammonia
Place damp, red litmus paper into the gas
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Oxygen
2.Extinguish it, but leave it glowing
3.Place the splint in a tube with the gas, it will relight if oxygen is present
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Tests for anions
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Halides
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The colors that should form are: White-Chloride, Cream-Bromide, Yellow-Iodide
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Testing for cations
Ammonium
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3.Ammonia gas is given off if ammonium ions are present and can be characterized by the pungent smell and the ammonia test.
Aluminum, calcium, copper, iron(II) and iron(III)
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Sodium hydroxide will react with the metal ions in the solution and form metal hydroxides that will appear as precipitates.
The colors they form are: White- aluminum and calcium, Blue- copper, Green- iron(II), Brown- iron(III)
High concentrations of these gases could be lethal, and so the tests can be used in factories that deal with these gases on a regular basis