Abstract
The following work was undertaken with a view to obtaining data for the tentative application of Van der Waals’ equation to concentrated solutions. It is evidently probable that if the ordinary gas equation be applicable to dilute solutions, then that of Van der Waals’, or one of an analogous form, should apply to concentrated solutions—that is, to solutions having large osmotic pressures. Saturated solutions were taken for investigation because they presumably have the greatest osmotic pressures, and also because there is reason to believe that, in concentrated solutions at a given temperature, the greater the concentration the less the relative dissociation. For the purpose in view, measurements of volume, pressure and temperature are required.

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