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 flo w microcalorimeter and densimeter to obtain heat capacities and densit ies for L-ascorbic acid and sodium chloride in water. These data are r eported in terms of apparent molar volumes (V(phi,2)) and apparent mol ar heat capacities (C(p,phi,2)). The volume of ionization (DELTAV0) an d heat capacity of ionization (DELTAC(p)0) for the acid at 298.15 K ha ve 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.