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One method of monitoring the progress of a redox reaction is to monitor the voltage potential of the solution as the reaction progresses. The equivalence point of the titration can be identified by the point where the voltage changes rapidly over a small volume of titrant delivered (much like the pH in an acid-base titration). In this reaction, we have a second method of monitoring the reaction progress. The MnO4 ion is a deep purple color, but its reduced form, the Mn2+ ion is colorless. As long as there is arsenous acid in the solution to reduce the permanganate, the solution will remain colorless. At the point in which all of the arsenous acid has been consumed, there will be an excess of permanganate ions and the solution will turn purple