1. Your halide needs to be dissolved in distilled water.
2. Put about 2cm depth of halide solution in a test tube.
3. Acidify the solution with dilute HNO3 - take care.
4. Add silver nitrate solution, drop by drop.
5. If a precipitate forms look at its colour to identify your halide.
White Precipitate = Chloride
Cream Precipitate = Bromide
Yellow Precipitate = Iodide
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