7. Calculate the values of the redox potential at pH = 0 during the titration of 40 ml of 0.05 N. arsenic acid solution 0.1 N. potassium permanganate solution, if the latter is added: a) 10 ml; b) 20 ml; c) 20.05 ml.
E0(H3AsO4/H3AsO3) = 0.56 V; E0 (MnO4 - / Mn2) \u003d 1.51 V.

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