The
density
(ρ) and sound speed (u) has been
measured for ascorbic acid ((5R)-[(1S)-1,2-dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one)
+ H2O + magnesium chloride (MgCl2) (or calcium
chloride (CaCl2), or barium chloride (BaCl2))
at temperatures T = (303.15, 308.15, 313.15, and
318.15) K and atmospheric pressure p = 0.1 MPa. These
parameters were then used to obtain thermodynamic
and acoustic functions such as apparent molar volume (ϕv), limiting apparent molar volume (ϕv
o), limiting apparent molar volume
expansibility (ϕE
o), adiabatic compressibility (κs), intermolecular
free length (L
f) and relaxation
time (τ). The ion–solvent and ion–ion interactions
in ascorbic acid + H2O system have been
discussed using these parameters. The effect of MgCl2,
CaCl2, and BaCl2 on these interactions as well
as on the solvent structure has also been discussed.