Qualitative analysis - Test for anions (-)

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7 Terms

1
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Carbonate (CO3²-)

Test: add dilute acid, then test for carbon doixide gas

Result: effervescence, carbon dioxide produced

2
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Chloride (Cl^-) - in solution

Test: acidify with dilute nitric acid, then add aqueous silver nitrate

Result: white ppt.

3
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Bromide (Br^-) - in solution

Test: acidify with dilute nitric acid, then add aqueous silver nitrate

Result: cream ppt.

4
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Iodide (I^-) - in solution

Test: acidify with dilute nitric acid, then add aqueous silver nitrate

Result: yellow ppt.

5
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Nitrate (NO3^-) - in solution

Test: add aqueous sodium hydroxide, then aluminium foil; warm carefully

Result: ammonia produced

6
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Sulfate (SO4²-) - in solution

Test: acidify with dilute nitric acid, then add aqueous barium nitrate

Result: white ppt.

7
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Sulfite (SO3²-) - in solution

Test: add a small volume of acidified aqueous potassium manganate (VII)

Result: (sulphur dioxide produced) turns the acidified aqueous potassium manganate (VII) from purple to colourless