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Name of ion Test Result
Calcium Ca 2+ (aq) Add sodium hydroxide White precipitate formed
solution in drops.…read more

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Iron(II) Fe 2+ (aq) Add sodium hydroxide Green precipitate formed.
solution in drops On standing changes to a
reddish brown colour.
Iron(III) Fe 3+ (aq) Add sodium hydroxide Reddish brown precipitate
solution in drops formed
Magnesium Mg 2+ (aq) Add sodium hydroxide White precipitate formed
solution in drops. Keep which remains even when
adding until in excess excess sodium hydroxide
solution is added
Name of Test Result
ion
Chloride To a solution of the halide ions add: White precipitate
CL (aq) 1.…read more

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Bromide To a solution of the halide ions add: Cream precipitate
Br (aq) 1. Dilute nitric acid (of AgBr)
2. Silver nitrate solution
Iodide To a solution of the halide ions add: Yellow precipitate
I (aq) 1. Dilute nitric acid (of AgL)
2. Silver nitrate solution
Sulphate Add: 1. Dilute hydrochloric acid White precipitate
SO4 2 2. Barium chloride solution (of BaSO4)
Nitrate 1. Add sodium hydroxide solution and warm Red litmus paper
NO3 (aq) 2. Add aluminium powder goes blue
3.…read more

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Carbon dioxide CO2 Pass gas through limewater Limewater goes
cloudy/milky
Chlorine Cl2 Put in a piece of damp blue Paper goes red then white
litmus paper
Ammonia NH3 Put in a piece of damp red Paper goes blue
litmus paper or Universal
indicator paper
Sulphur Dioxide SO2 Put in a piece of damp Colour changes from
potassium dichromate (VI) orange to green
paper…read more

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