A Level Chemistry- Chemical Tests and their Results

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For the WJEC Board A Level

5 Terms

1
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How do you test for a Carbonate?

Add dilute HCl. effervescence with be visible. The effervescence will turn limewater cloudy due to CO2 being released

2
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How do you test for Sulfate?

Add dilute HCl then aqueous Barium Chloride or Barium Nitrate

3
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How do you test for Iodide, Bromide and Chloride Ions

Add dilute Nitric acid then aqueous Silver Nitrate followed by Ammonia solution. Chloride will give a white precipitate, Bromide will give a cream precipitate, Iodide will give a yellow precipitate

4
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How do you test for Ammonium

Add aqueous Sodium Hydroxide and gently heat. Ammonia gas is released turning damp red litmus paper blue

5
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