Question

From the following anions: Br-, CO₃^2- Cl-, I-, NO₃^-, SO₄^2-, list the ions that meet the following criteria.

1a) Is involved in an oxidation-reduction reaction as part of a confirmation reaction.

1b) Does not produce a precipitate in any classification or confirmatory reaction described in this experiment.

Info about the experiment: This experiment is titled " The Chemistry and Qualitative Analysis of Anions" and there is information about acid-base reactions, hydrolysis reactions, oxidation-reduction reactions, disproportionation reactions, decomposition, precipitation, dissolution, ion product and extraction in the pre-lab.

Please make sure they are correct and I will mark your answer thumbs up. Thank you so much!!

Answer 1

1.a)

Nitrate (NO₃^-) undergoes reduction - oxidation reaction in its confirmatory test. The confirmatory test is Brown ring test where Fe (II) is oxidised to Fe (III) and NO₃^- is reduced.

b)

Only nitrate (NO₃^-) can not be detected by precipitate because nitrate can not produce any water insoluble salt. Rest of the ions can be detected by precipitation reactions.

Cl^-; Br^- and I^- can be detected by precipitation with AgNO3 whereas SO₄^-2 and CO₃^-2 can be detected by precipotarion with BaCl2.