I need potassium ferrocyanide as an electron donor in my system, but currently we have pottasium ferricyanide available in our lab, may I know if I can reduce ferricyanide to ferrocyanide by any reducing agent?
Upon searching, I have found this statement in a website, is that true?
May I kindly ask for your viewpoints?
"http://chemistry.proteincrystallography.org/article148.html" :An interesting case of the oxidising and reducing action of hydrogen peroxide was discovered by Brodie. An acid solution of potassium ferrocyanide is oxidised by hydrogen peroxide to potassium ferricyanide: 2K4FeC6N6 + H2O2 = 2K3FeC6N6 + 2KOH. An alkaline solution of potassium ferricyanide, however, is reduced to potassium ferrocyanide by hydrogen peroxide, with evolution of oxygen: 2K3FeC6N6 + 2KOH + H2O2 = 2K4FeC6N6 + 2H2O + O2."
Dear Tahereh Jafary
the following link may be useful to reduce the ferricyanide to ferrocyanide by using ascorbic acid reaction, formal oxidation-reduction reaction and through electrolyte method
http://webs.wofford.edu/splawnbg/Chem_214_files/Redox%20titration%20of%20ferri%20to%20ferro%20illustrating%20the%20nernst%20eq%20and%20beer's%20law.pdf
http://www.new1.dli.ernet.in/data1/upload/insa/INSA_2/20005ad4_333.pdf
http://thesis.library.caltech.edu/3194/9/chapter5.pdf
The redox chemistry of iron hexacyanide is very complex, depends on pH, electrolyte nature and concentrations. I would not recommend to use it unless you well understand what you are dealing with.
I must remember you that nomenclatre call them hexacianoferrato 3- and 4- respectively. 4-is thermodynamically more stable..
Luis,
you have to use the IUPAC recommended nomenclature (names). "hexacianoferrato" does not exist.
IUPAC name
iron(3+) hexacyanide
iron(2+) hexacyanide
I always use IUPAC nomenclature.In fact I have been a member of the
Commission for 15 years. Have they changed again going back to 1957?
Thanks so much Dear Prof Luis and Yurri, and sorry for not using the IUPAC name, that are Potassium hexacyanoferrate(III) and (II), and thanks so much Mr Harish for your attentions and links. As I got by your replies, it not easy to reduce it to the latter one.
Thanks for all your precious advise.
I believe these reactions mentioned above are possible as acid or alkaline solutions are responsible for pH adjustment.
Tahereh,
"As I got by your replies, it not easy to reduce it to the latter one." This is not the problem, you can buy a reduced form . The problem is:
The redox chemistry of iron hexacyanide is very complex, depends on pH, electrolyte nature and concentrations. I would not recommend to use it unless you well understand what you are dealing with.
Thanks so much Prof Ghasem for attention, i asked the question here for getting advice from experts since upon searching i have found that The redox chemistry of iron hexacyanide is very complex as prof Yurri mentioned as well. .
Prof Yurri, I have already ordered the latter one, just though it might be possible to reduce the existing one to continue the process until the chemical arrives. Thanks so much for your great attention and precious advice.
can i use them interchangeably for colour development in determining steroids in plant extract, the procedure says Potassium ferricyanide but i have Potassium ferrocyanide. i am using it with sulfuric acid and iron chloride
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