Question

Conversion of ferric sulphate to ferrous sulphate is which type of reaction?
Is it reduction?
Fe3+ = Fe2+

Answer 1

effective approach to minimize/reduce Fe2+ oxidation. Further, removing oxygen from water can help to minimize oxidation. You can purge your pure water from oxygen before dissolving Fe 2+ salt by bubbling in it nitrogen or argon for 5-10 min.  or more. Also you can measure oxygen level by an oxigen probe and a multimeter to assure complete oxigen removal or minimization. You can also repeat this step with nitrogen or argon every time you use the stored Fe2+ solution.

When I worked in the past with such Fe2+ solutions, I tried an empyrical spectrophotometric metod for rapidly testing Fe2+ and Fe3+ levels at every time: Fe3+ could be complexed with a very selective chelating agent that is Desferoxamine (Desferal) which forms a yellow-orange colored adduct that can be measured spectrophotometrically; in the same way Fe2+ could be selectively chelated by Ferrozine, which forms a purple-violet complex that you could quantitate by spectrophotometer too. Obviously these colorimetric reaction are probably subjected to some interferences...but used in a pure solution that contains only Fe 2+ and, probably, in a certain amount, Fe+3, this approach ... may works...!! Hoping these suggestion may be useful to you ... best wishes!!

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Answer 2

It is oxidation reaction
2FeSo4 + H2So4 + H2O2 = Fe2(So4)3 + 2H2O