Abstract
Methyl- p-benzoquinone (MQ) gives a single polarographic wave in methyl cellosolve media containing perchlorate as supporting electrolyte, but a prewave corresponding to the reaction Q + 2HA + 2e ái H 2Q + 2A -, is found when an acid is added. The height of the prewave is proportional to the concentration of added acid. Traces ( ca. 0.2%) of free perchloric acid can be determined in crude lithium perchlorate. The half-wave potential of the prewave depends on the p K a value of the acid; if the dissociation constants of acids differ sufficiently, two prewaves are found and each acid species can be determined simultaneously. This method was applied to the MQ-HClO 4-CH 3COOH, MQ-CCl 3COOH-CH 3COOH and MQ-CHCl 2COOH- CH 3COOH systems.
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