The Ultraviolet Absorption Spectra and the Hydrolysis of \overset4P-\overset3P-\overset4P-Acid
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It has been found that \overset4P-\overset3P-\overset4P-acid in aqueous solutions shows characteristic ultraviolet absorption spectra, which vary remarkably with the pH change of the solutions. The spectra having absorption maxima at 226, both 205 and 230, 224, and 215 mμ can be assigned to P<SUB>3</SUB>O<SUB>8</SUB><SUP>5−</SUP>, HP<SUB>3</SUB>O<SUB>8</SUB><SUP>4−</SUP>, H<SUB>2</SUB>P<SUB>3</SUB>O<SUB>8</SUB><SUP>3−</SUP>, and H<SUB>5</SUB>P<SUB>3</SUB>O<SUB>8</SUB> respectively.<BR>The rates of the hydrolysis of the \overset4P-\overset3P-\overset4P– acid in the perchloric acid solutions have been determined by measuring the absorbance at 215 mμ. The hydrolysis follows the first order rate law. The hydrolysis products are \overset3P– and \overset4P-\overset4P-acid. The rate constant is in the linear function with the activity of perchloric acid. The activation energy has been estimated to be 16.6 kcal. per mol.
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