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22921139
Testing for anions
Description
This mindmap shows the ions in a solution and the corresponding process to test for those ions in order to ensure that they are definitely present in the solution.
No tags specified
chemistry
ions
ion
chem
triple
testing
science
Mind Map by
john john
, updated more than 1 year ago
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Created by
Joshua Rees
over 8 years ago
Copied by
john john
over 4 years ago
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Resource summary
Testing for anions
Ammonium ions can be tested for by adding a few drops of dilute sodium hydroxide solution and heating.
If ammonium ions are present, ammonia gas will be a product of the reaction and will turn red litmus paper blue.
Carbonate ions can be tested for by adding some dilute hydrochloric acid.
If carbonate ions are present, carbon dioxide gas will be a product of the reaction and will turn limewater cloudy.
Sulphate ions can be tested by firstly adding some dilute hydrochloric acid followed by some barium chloride solution.
If sulphate ions are present, barium sulphate will be a product of the reaction and a white precipitate will form.
Halide ions
Halide ions can be tested for by adding some dilute nitric acid followed by some silver nitrate solution
Different halides form different coloured precipitates as different products are formed.
Chlorine ions
Silver chloride
White precipitate
Bromide ions
Silver bromide
Cream precipitate
Iodide ions
Silver iodide
Yellow precipitate
Nitrate ions
Nitrate ions can be tested for by adding some sodium hydroxide solution followed by some aluminium powder or foil and then heating strongly.
If nitrate ions are present, ammonia gas will be a product of the reaction and will turn red litmus paper blue because it is a strong alkali.
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