Densities were measured for ternary mixture of diglycine in aqueous of (0.01, 0.02, 0.03, and 0.04) mol kg-1 sulphanilamide (SAM), sulphanilic acid (SAN), and sulphosalicylic (SSAD) acid dihydrate at T = 288.15 to 308.15 K, using vibrating tube digital densimeter. Apparent molar volume has been determined from the experimental densities and the least-square fitting was carried out for the calculation of limiting apparent molar volumes values and the increase in these values has the following order in the investigated system: SAN less than SAM less than SSAD. The calculated limiting apparent molar volumes values indicate that diglycine - SSAD interactions are stronger than the other two drugs. These data were used to calculate the transfer values of partial molar volumes. Transfer parameters have been interpreted from the point of view of concentration dependence of solute - solute and solute - solvent interactions. The limiting apparent molar expansibility values for diglycine in aqueous solution of drugs have positive value and decrease with rise of temperature. The calculated values of thermal expansion coefficient have small and positive values whereas the values of Hepler's constant have positive value except with SSAD. Hydration numbers have also been determined. The variation of these parameters with concentration and temperature clearly suggests the roles of diglycine and sulpha drugs in solute - solvent interactions.
Compounds
#
Formula
Name
1
C4H7NO4
N-(carboxymethyl)glycine
2
C6H8N2O2S
4-aminobenzenesulfonamide
3
C6H7NO3S
4-aminobenzenesulfonic acid
4
C7H6O6S
5-sulfosalicylic acid
5
H2O
water
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.