practical 4 - testing for anions

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Last updated 4:14 PM on 6/13/26
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9 Terms

1
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Test for ammonium ions

  • Add NaOH

  • Gently heat

  • Hold damp red litmus over

  • Production of ammonia gas - litmus turns blue

2
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Test for carbonate ions

  • Add dilute HCl

  • Test gas with limewater

  • Co2 gas turns limewater cloudy

  • Effervescence

3
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Test for sulfate ions

  • Add BaCl2 solution acidified with HCl (HCl reacts with carbonate impurities so barium carbonate precipitate isnt formed)

  • Production of white precipitate (BaSO4)

4
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Test for chloride (aq)

  • Add nitric acid (to react with any carbonates present) then add silver nitrate

  • White precipitate (AgCl)

5
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Test for chloride (solid)

  • Add dilute ammonia solution

  • White precipitate dissolves

6
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Test for bromide (aq)

  • Add nitric acid then silver nitrate solution

  • Production of cream precipitate (AgBr)

7
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Test for bromide (solid)

  • Add dilute CONC ammonia solution

  • Cream precipitate dissolves

8
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Test for iodide (aq)

  • Add nitric acid then silver nitrate solution

  • Production of yellow precipitate (AgI)

9
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Test for iodide (solid)

  • Add concentrated ammonia solution

  • Yellow precipitate doesn’t dissolve