quantitative analysis - test for anions

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5 Terms

1
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TEST FOR CARBONATE IONS (CO3 2-)

Test: Add dilute nitric acid HNO3 (aq)

Obs: effervescence observed, colorless and odorless gas evolved formed white precipitate with limewater. Gas evolved is Carbon Dioxide (CO2)

2
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TEST FOR SULFATE IONS (SO4 2-)

Test: Acidify first with dilute nitric acid HNO3 (aq), then add aqueous barium nitrate Ba(NO3)2 (aq)

Obs: White precipitate is formed BaSO4 (s)

3
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TEST FOR CHLORIDE IONS (Cl-)

Test: Acidify first with dilute nitric acid HNO3 (aq) then add aqueous silver nitrate AgNO3 (aq)

Obs: White precipitate is formed AgCl

4
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TEST FOR IODIDE IONS (I-)

Test: Acidify first with dilute nitric acid HNO3 (aq) then add aqueous silver nitrate AgNO3

Obs: (pale) Yellow precipitate is formed AgI

5
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TEST FOR NITRATE IONS (NO3-)

Test: Add aqueous sodium hydroxide NaOH (aq), then add aluminum foil and warm carefully

Obs: Colorless, pungent gas evolved which turned red litmus paper blue. Gas produced is ammonia NH3