Which reagent would you use to test for bromide ions by forming a cream precipitate?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which reagent would you use to test for bromide ions by forming a cream precipitate?

Explanation:
The test relies on silver ions forming insoluble silver halide precipitates with halide ions, and the color of the precipitate identifies which halide is present. For bromide, the precipitate is cream-colored, produced by silver bromide. So the reagent you add to generate that cream precipitate is silver nitrate (under acidic conditions). The other reagents wouldn’t give the characteristic cream AgBr precipitate with bromide—barium chloride tests for sulfate (not bromide), sodium hydroxide doesn’t selectively reveal bromide via a cream precipitate, and copper sulfate isn’t used for this halide test.

The test relies on silver ions forming insoluble silver halide precipitates with halide ions, and the color of the precipitate identifies which halide is present. For bromide, the precipitate is cream-colored, produced by silver bromide. So the reagent you add to generate that cream precipitate is silver nitrate (under acidic conditions). The other reagents wouldn’t give the characteristic cream AgBr precipitate with bromide—barium chloride tests for sulfate (not bromide), sodium hydroxide doesn’t selectively reveal bromide via a cream precipitate, and copper sulfate isn’t used for this halide test.

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