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iGCSE Chemistry - Ion Tests

1) Anions

Anion Test used Result

Carbonate CO32- Add dilute acid Bubbles - CO2 being produced

Chloride Cl- Acidify and add aqueous silver White precipitate formed
nitrate

Iodide I- Acidify and add aqueous silver Yellow precipitate formed
nitrate

Nitrate NO3- Add aqueous NaOH and Ammonia…

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Example equations:

CuSO4(aq) + 2NaOH(aq) --> Cu(OH)2(s) + Na2SO4(aq)

Al2(SO4)3 + 6NaOH(aq) --> 2Al(OH)3 + 6Na2SO4



3) Gases

Gas Test used Result

Ammonia NH3 Litmus Paper Turns damp red litmus paper blue

Carbon Dioxide CO2 Limewater Turns limewater milky

Chlorine Cl2 Litmus Paper Bleaches paper white

Hydrogen H2 Lit Splint…

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