Effect of Drop Size and Wall Solution Concentration on Determinations Made with the Hill-Baldes Method

Abstract

Summary

Experiments are described that test the effect on osmotic pressure readings made with the Hill-Baldes vapor tension method, of the size of the drops placed on the thermocouple loops and of the concentration of the solution placed on the walls of the thermocouple chamber. Evidence is presented indicating that when readings are made over long periods of time after drop deposition on the thermocouple loops the drops must be of equal size and the reference and wall solutions must be identical if accurate osmotic pressure values are to be obtained throughout the course of the experiment.