Tests for Anions (Leaving Cert Chemistry)

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9 Terms

1
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anion

negatively charged ion

2
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precipitate

material that settles out of solution

3
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standard procedure

salt dissolved in deionised water, clear solution obtained, reagent added

4
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chloride ions

silver nitrate solution, white precipitate, dilute ammonia, precipitate disappears

5
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sulfate and sulfite ions

barium chloride, white precipiates, dilute Hcl causes precipitate to disappear in barium sulfite

6
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carbonate and hydrogencarbonate ions

placed in boiling tube, Hcl added, tube bubbles through limewater, fizzes and turns milky, carbon dioxide produced

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distinguish between carbonate and hydrogencarbonate ions

magnesium sulfate forms in the carbonate as magnesium carbonate is insoluble in water

8
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nitrate ions

iron ii sulphate added, concentrated sulfuric acid added down the side, layers separate with brown ring at junction

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phosphate ions

ammonium kilt date added, concentrated nitric acid added, placed in warm water, yellow precipitate