1971 Volume 44 Issue 10 Pages 2582-2587
An apparatus capable of following reaction rates under pressure without sampling has been designed and constructed. The pressure change due to the progress of a reaction in a closed system could be accurately measured to about 0.08 atm by means of a “fixed bridge” combined with a manganin pressure gauge, in which the unbalanced e.m.f. generated at a constant bridge current was potentiometrically determined to 0.1 μV. The rates of the acid-catalyzed inversion of sucrose and the base-catalyzed decomposition of diacetone alcohol, with the expansion in volume and the contraction respectively, were measured in order to verify the applicability of this apparatus. The agreement between the results obtained by this method and those obtained by the analytical method was satisfactory. From these results, it has been confirmed that the method is sufficiently applicable to the measurement of reaction rates under pressure.
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