Chemistry - test for anions

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5 Terms

1
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Test for carbonate ions (CO3 2-)

1 - Add DILUTE ACID
2 - Bubble gas released through LIMEWATER
3 - Limewater turns CLOUDY (CO2)

2
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Test for nitrate ions (NO3 -)

1 - Add aqueous NAOH and ALUMINIUM FOIL
2 - Warm gently
3 - Gas released turns DAMP RED LITMUS PAPER BLUE → AMMONIA

3
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Test for halide ions

1 - ACIDIFY sample with DILUTE HNO3
2 - Add AGNO3 SOLUTION
3 - SILVER HALIDE PRECIPITATE forms
(Cl - white, Br - cream, I - yellow)

4
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Test for sulfate ions (SO4 2-)

1 - ACIDIFY sample with DILUTE HNO3
2 - Add few drops of BA(NO3)2 SOLUTION
3 - WHITE PRECIPITATE of BASO4

5
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Test for sulfite ions (SO3 2-)

1 - Add DILUTE ACID
2 - warm mixture gently
3 - Bubble gas released through (ACIDIFIED) POTASSIUM MANGANATE (VII) SOLUTION
4 - Potassium manganate (VII) solution changes from PURPLE TO COLOURLESS