HYDROGEN PEROXIDE AND ITS ANALOGUES: VIII. EXCESS FUNCTIONS FOR THE BINARY SYSTEMS H₂O–H₂O₂ AND D₂O–D₂O₂

Abstract

Recent volumetric and calorimetric data have been used to calculate the excess functions for mixtures of water and hydrogen peroxide over the entire concentration range. The results are compared with those for the corresponding deuterium compounds. The existing calorimetric and vapor-pressure measurements are not comprehensive nor accurate enough to support discussion of the finer details of the excess quantities. A maximum in the excess-volume curves, presumably related to the formation of the compound H 2 O 2 .2H 2 O, persists in the liquid mixtures over an appreciable temperature range above the melting point of that compound. A possible crystal structure is proposed for the latter.New density determinations were carried out on mixtures of heavy water and deuterium peroxide at 0° and 20 °C. and the effect of deuterium peroxide on the temperature of maximum density of heavy water was measured and compared with that of deuterated alcohols. It is concluded that the structure of liquid water is easily penetrated by hydrogen peroxide molecules.