Abstract
A theoretical treatment of the effect of variations in barometric pressure and other factors on the ebullioscopic determination of molecular weights leads to general expressions relating the variations in barometric pressure with the ebullioscopic constant of the solvent and with the temperature sensitivity of the Menzies differential thermometer. Since these variations can affect significantly the accuracy of ebullioscopic molecular weight determinations, a single comprehensive correction term is calculated for each of the usual combinations of ebullioscopic solvent and thermometer filling liquid; this term enables results obtained at different pressures to be corrected to standard atmospheric pressure, thus eliminating the pressure effect. Finally a statistical analysis of some experimental results illustrates the validity of the correction term for the combination of benzene as ebullioscopic solvent with benzene as thermometer filling liquid.
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