Redox reaction (2)

No matter in CE or AL level, potassium dichromate solution used must be acidified.

Acidified potassium dichromate solution is a strong oxidizing agent, and can oxidize a number of reducing agents, but not only KI and FeSO4.

For example, potassium bromide (or sodium bromide) solution can be oxidized to bromine solution by acidified potassium dichromate solution.
Cr2O72-(aq) + 14H+(aq) + 6Br-(aq) → 2Cr3+(aq) + 7H2O(l) + 3Br2(aq)

For example, sodium sulphite solution can be oxidized to sulphate solution by acidified potassium dichromate solution.
Cr2O72-(aq) + 8H+(aq) + 3SO32-(aq) → 2Cr3+(aq) + 4H2O(l) + 3SO42-(aq)

many reactants(RA) can be oxidized by potassium dichromate