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Test for Halide Ions

To test for halide ions silver nitrate is added to a solution of the halide.A precipitate forms.This test cannot be used to test for fluorides as silver fluoride is soluble. Dilute nitric acid is added to make sure that other anions e.g. carbonates are removed and do not form precipitates.Ag+ (aq) + X-(aq) → AgX (s)

With ammonia:AgCl (s) + 2NH3 (aq) → [Ag(NH3)2]+ (aq) + Cl- (aq)

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 4B: The elements of Group 7 (halogens). Topic: Group 7.

Key terms in this lesson

precipitate
An insoluble solid that forms and separates out of a solution during a reaction.

More in Group 7

All 14 lessons in Group 7 · All Edexcel AS-level Chemistry topics