What is the oxidation potential of As(III)?

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Yurii V Geletii

Your question is not clear. The oxidation potential of arsenic(III) depends on pH.Therefore you need the Eh-pH diagram.

Arpan Sarkar

In that case Dr. Geletti could you please tell me the oxidation potential of NaAsO2 (Na+ + AsO2- ) at pH~7 in aqueous medium?

I'm not sure that AsO2- exists in water at pH~7. you have to look at speciation of Arsenious acid (hydrogen arsenite) H3AsO3. Read

http://www.iisc.ernet.in/currsci/apr102001/837.pdf