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Abstract
AbstractThe values of E and log. A in kT = A e ‐E/RT. which have been published for the oxidation of succinic acid with chromic acid in sulphuric acid of varying strength, allow one to calculate kT for any temperature. The maximum which was found in the kT‐acid concentration curve must show a shift to lower sulphuric acid concentrations with decrease of the temperature. At −40° it is found very near to the composition SO3 3 aq. This, and the fact that the speed of oxidation increases rapidly with the acid concentration as soon as the composition SO3 5 aq. has been reached, leads to the conclusion that SO3 3 aq. is one of the active components of the system. Comparison of the speed of decomposition of chromic acid, the speed of oxidation of organic substances and the speed of decomposition of organic substances by sulphuric acid, leads to the conclusion that a second hydrate, probably 2 SO3 1 aq. is active too. It is known that reactions which are dependent on the concentration of this substance have an abnormally high temperature coefficient. The superposition of the effects caused by these two hydrates explains the behaviour of solutions of sulphuric acid in water at different temperatures in a number of cases.
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