Flow Diagram Summarising Tests For Positive Ions (Cations) Page 2

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Flow Diagram Summarising Tests for Negative Ions (Anions)
Dissolve a small amount of solid in water
Add aqueous hydrochloric acid
solution
Is a gas given off?
NO
YES
1
2
CO
limewater goes cloudy
2
Add barium
Make a fresh
chloride
solution of
solution
unknown
2-
CO
3
Carbonate ion
Add nitric acid
White
solution
precipitate?
Add silver
nitrate solution
-
Cl
White
White
Chloride
Precipitate
precipitate?
Precipitate
-
formed?
Cream
Br
Precipitate
Bromide
2-
SO
4
Sulphate ion
-
Yellow
I
Precipitate
Iodide
YES

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