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OCR Chemistry A Level 2015 > Qualitative Analysis > Flashcards

Flashcards in Qualitative Analysis Deck (9)
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1

Name 3 common anions

Carbonate, sulfate and halide

2

How do you test for carbonate ions?

Add diluted HNO3 and any gas through limewater and positive if white precipitate (CaCO3)

3

The equations for the testing of carbonate ions

CO3 2- + 2H+ ----------> CO2 + H2O
Ca(OH)2 + CO2 ----------> CaCO3 + H2O

4

How do you test for sulfate ions?

Make a solution of the sample and add drops of barium nitrate solution and positive result if white precipitate (barium sulfate)

5

The equation for the testing of sulfate ions

Ba 2+ + SO4 2- ----------> BaSO4

6

How do you test for halide ions?

Add drops of silver nitrate solution and then aqueous ammonia

7

Name a cation

Ammonium ion

8

How do you test for ammonium ions?

Add warm NaOH solution and test any gas with damp red litmus paper - if blue, means gas is alkali (ammonia gas)

9

Equation for the testing of ammonium ions

NH4+ + OH- ----------> NH3 + H2O