Studies on the Problem About the Instrumental Constant in Vapour Pressure Osmometry

Abstract

Abstract: The problem about the molecular weight dependence of the instrumental constant Kof vapor pressure osmometry was studied in Knauer VPOapparatus by using four low molecular weight organic compounds and six narrow molecular weight distribution oligometic polystyrene samples with the known average molecular weights. There exists the effect of solute adsorption in VPO, which leads to the result that the instrumental constant Kis apparently dependent upon the molecular weight of the solute. The dependence of the Kon the molecular weight of the solute was eliminated by modifying a factor of solute adsorption.

Key words: Vapor pressure osmometry, Number average molecular weight, Instrumental constant, Adsorption effect (Ed.: H, L)

CLC Number:

O631.6

TrendMD:

WANG Zhi-Liu, CHENG Rong-Shi . Studies on the Problem About the Instrumental Constant in Vapour Pressure Osmometry[J]. Chem. J. Chinese Universities, 1998, 19(9): 1522.

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Studies on the Problem About the Instrumental Constant in Vapour Pressure Osmometry

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