The Refractive Index of H2H2O; The Refractive Index and Density of Solutions of H2H2O in H1H1O

Abstract

A determination has been made of the refractive index of nearly pure ${\mathrm{H}}_2^2$O and of a 50 percent solution of ${\mathrm{H}}_2^2$O in ${\mathrm{H}}_2^1$O over a range of temperatures and wave-lengths. In both cases temperatures of maximum refractive index have been found. The differences between these temperatures and the temperature of maximum refractive index for ordinary water are in accord with the differences in those physical properties of the two kinds of water which have already been investigated. The dispersion of ${\mathrm{H}}_2^2$O is lower than that of ${\mathrm{H}}_2^1$O. The densities and refractive indices of solutions of different concentrations of ${\mathrm{H}}_2^2$O in ${\mathrm{H}}_2^1$O have been determined. It is found that these solutions do not obey the laws of the ideal solution to the extent that the partial molal volumes are functions of the concentration of the isotopic water. This deviation from ideality is not found in the refractive indices of these solutions.