Answers GROUP 7: TESTING for HALIDE IONS

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Chemguide – answers GROUP 7: TESTING FOR HALIDE IONS 1. a) Silver fluoride is soluble in water, and so you wouldn't get a precipitate. b) The acid reacts removes any other ions present which might cause a confusing precipitate. c) Silver iodide. d) Ag+ + I- AgI (aq) (aq) (s) e) ion observation Cl- White precipitate Br- Pale cream precipitate I- Pale yellow precipitate f) precipitate from effect of adding dilute ammonia effect of adding concentrated solution ammonia solution chloride ions Precipitate dissolves to give a Precipitate dissolves to give a colourless solution colourless solution bromide ions Little effect – precipitate is almost Precipitate dissolves to give a unchanged colourless solution iodide ions Precipitate doesn't dissolve Precipitate doesn't dissolve 2. The equilibrium involving the ammonia lies well to the right, and therefore the concentration of free silver ions in solution is greatly lowered. The equilibrium + - AgHal(s) Ag (aq) + Hal (aq) will move to the right in order to replace them (Le Chatelier's Principle). Silver chloride is the most soluble of the three halides, and in this case, the equilibrium shift is enough that the solution is no longer saturated, and so the precipitate dissolves. Silver bromide is less soluble than silver chloride, and using dilute ammonia doesn't remove enough free silver ions to stop the solution being saturated. But concentrated ammonia shifts the equilibrium Ag+ + 2NH [Ag(NH ) ]+ (aq) 3(aq) 3 2 (aq) further to the right (Le Chatelier's Principle), and reduces the free silver ion concentration enough that the silver bromide solution is no longer saturated, and so the precipitate dissolves. Silver iodide is so insoluble that no amount of ammonia will lower the concentration of free silver ions enough for the precipitate to dissolve. I have tried to produce this answer without talking about solubility products. If your syllabus expects you to know about solubility products, it is slightly easier to explain using them – see the Chemguide page. www.chemguide.co.uk.

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