Lab 9: The Chemistry and Qualitative Analysis of Anions Pre-Laboratory Assignmen

Question

Lab 9: The Chemistry and Qualitative Analysis of Anions Pre-Laboratory Assignment 1. Of the following anions, Br ,co C1 I NO3 NO2 ,PO 4 and SO3 st those ions that meet the following criteria. Gives a precipitate with Ag ion that is insoluble in HNO3. (2) Is involved in an oxidation-reduction reaction as part of a confirmation reaction. (3) Gives a precipitate with Ba ion that is soluble in HNO. (4) Evolves a gas when acid is added. (5) Releases an odorous gas as a product. (6) Does not produce a precipitate in any classification or confirmatory reaction described in this experiment

Explanation / Answer

1. Br-, Cl-, I- ions give a precipitate with Ag+ ion that is insoluble in HNO3.

2. Br-, Cl-, I-, NO3- ions are involved in an oxidation-reduction reaction as part of a confirmation reaction.

3. CO32-, PO43- give a precipitate with Ba2+ ion that is soluble in HNO3.

4. CO32-, NO3-, NO2-, SO32- evolve a gas when acid is needed.

5. NO3-, NO2-,SO32- ions release an odorous gas as a product.

6. SO42- produces a precipitate in any classification or confirmatory reaction described in this experiment.

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