The test for halides is dead easy. First you add dilute nitric acid to remove ions which might interfere with the test. Then you just add dilver nitrate solution (AgNO3). A precipitate is formed (of silver halide).
Ag+ + X- ----> AgX (where X is F, Cl Br or I)
The colour of the precipitate identifies the halide.
Fluoride (F-) = no precipitate, Chloride (Cl-) = white precipitate), Bromide (Br-) = cream precipitate, Iodidie (I-) = yellow precipiate
Then to be extra sure, you can test your results by adding ammonia solution. Each silver halide has a different solubility in ammonia.
Chloride (Cl-)= white precipitate, dissolves in dilute NH3, Bromide (Br-) = cream precipitate, dissolves in conc. NH3, Iodide (I-) = yellow precipitate, insoluble in conc. NH3
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