Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5413594 | Journal of Molecular Liquids | 2007 | 10 Pages |
Abstract
Vapour pressures of water over saturated solutions of l-ascorbic acid and calcium-l-ascorbate were measured in the 280 K to 318 K temperature range and the activities of water, osmotic coefficients and the molar enthalpies of vaporization were derived from them. Densities of aqueous solutions of l-ascorbic acid, magnesium-l-ascorbate and calcium-l-ascorbate were determined at 5 K temperature intervals, from T = 288.15 K to T = 333.15 K. Densities served to evaluate the apparent molar volumes, V2,Ï(m,T), the cubic expansion coefficients, α(m,T) and the changes of isobaric heat capacities with respect to pressure, (âCP / âP)T,m. They were qualitatively correlated with the changes in the structure of water when ascorbic acid and magnesium and calcium ascorbates are dissolved in it.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Alexander Apelblat, Emanuel Manzurola,