THE VOLUMETRIC AND THERMOCHEMICAL PROPERTIES OF L-ASCORBIC-ACID IN WATER AT 288.15-K, 298.15-K, AND 308.15-K

Measurements have been made at 288.15, 298.15, and 308.15 K with a flow microcalorimeter and densimeter to obtain heat capacities and densities for L-ascorbic acid and sodium chloride in water. These data are reported in terms of apparent molar volumes (V(phi,2)) and apparent molar heat capacities (C(p,phi,2)). The volume of ionization (DELTAV0) and heat capacity of ionization (DELTAC(p)0) for the acid at 298.15 K have been calculated using a method that does not require volumetric and thermochemical data for the sodium salts of the acid. Details of our methodology are presented.