Maleic hydrazide was found to be similar to maleic acid in its polarographic behavior. Two pairs of double waves are produced, one in the region around pH 5.9 and the other around 8.2. The theory that the double waves are a result of the reduction of the undissociated acid followed by that of its anion at a higher negative potential appears to explain the first of these double waves but fails to explain the second.
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D. M. Miller (1955) studied this question.
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