The rate of decomposition of ozone in aqueous perchloric acid has been measured spectrophotometrically, iodometrically and manometrically, and found proportional to the three-halves power of the ozone concentration, in agreement with the reaction scheme proposed by J. Weiss. In connection with the kinetic experiments, the molar extinction coefficient of ozone at 260 m/ , and the Henry's law constant, have been determined for solutions of ozone in 0.01 M HClOi. As in the case of hydrogen peroxide, it is difficult to obtain reproducible rates of decomposition from day to day, and the greater (1)
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