Dimethyl sulphoxide (DMSO) is normally used in organic oxidation reaction. It can also oxidize ferrous salt to ferric. What is the stoichiometry of this oxidation reaction ?
I do not have an answer for you but I found this info for the time being:
https://www.researchgate.net/post/How_can_I_block_the_oxidation_of_Fe2_to_Fe3_in_aqueous_media_Do_I_add_any_chemical_reagents_to_the_solution
Please provide a reference for your statement:
"It can also oxidize ferrous salt to ferric. "
Thanks for your answers. I took ferrous sulfate in 10 ml water. The green color of the solution suddenly changed to brown when I added 35 ml of DMSO. This DSMO water ratio was a needed condition of the reaction. Seeing the change in color of the solution from greenish to brownish it was sure that ferrous salt was oxidized to ferric instantly. In literature, I have found about the oxidation process of ferrous salt by DMSO. However, I have not got the possible reaction stoichiometry of this oxidation reaction.
"In literature, I have found about the oxidation process of ferrous salt by DMSO." This is not the answer.
Color changes might be due to Fe/DMSO complex formation. The experiment must be done under Ar. Otherwise O2 could be the oxidant.
Only change in visible color of the solution does not indicate oxidation. You can do prussian blue test to detect whether it is ferrous or ferric.
Or you can evaporate the solvent at room temperature to obtain the crystals and perform EPR study to confirm ferrous or ferric.
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