Using the solution reaction isoperibol calorimeter, molar enthalpies of solution, DsolHm, for ionic liquid [C3mim][OAc] with different molalities were measured in the temperature range from (288.15 to 308.15 +- 0.01) K with an interval of 5 K. In terms of Archer s method, the standard molar enthalpies of solution, DsolHh m, for [C3mim][OAc] were obtained in the temperature range of (288.15 to 308.15 +- 0.01) K. According to Glasser s theory of lattice energy the hydration enthalpy of cation and anion in infinite dilution aqueous [C3mim][OAc], (DH+ + DH-) = 514 kJ mol 1, at 298.15 K. Plotting the experimental values of DsolHh m against DT, a good straight line was obtained and the slope of the line is the standard molar heat capacity of solution. DCh p;m = 200 J K 1 mol 1, for [C3mim][OAc] and the specific heat capacity of solution, DCh p = 1.09 J g 1 K 1, was also obtained. The contribution per methylene to the molar solution enthalpy DsolHh m ( CH2 ) = 0.76 kJ mol 1 and the contribution from fitted values calculated for the temperature, DsolHh m ( CH2 ) = 0.90 kJ mol 1, at 298.15 K, they are approximately equal. The values of the standard molar heat capacity of solution, DCh p;m, and the specific heat capacity of solution, DCh p, decrease with the increase of chain of methylene ( CH2 ) of [Cnmim][OAc] (n = 2, 3).
Compounds
#
Formula
Name
1
C9H16N2O2
1-propyl-3-methylimidazolium acetate
2
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.