ABSTRACT

Dilution enthalpies of propionic, butyric, valeric and caproic acid in water were measured at 293.15, 298.15, 303.15 and 308.15Kusing an LKB flowmicrocalorimeter. Experimental datawere treated according to the McMillan Mayer theory to obtain the homotactic enthalpic interaction coefficients. The value of the coefficients is positive and increases with chain length showing that hydrophobic interactions are enhanced. The obtained values of the interaction coefficients are interpreted in terms of solute solvent and solute solute interactions and are used as indicative of hydrophobic behavior of the carboxylic acids studied.

Compounds

#	Formula	Name
1	C3H6O2	propanoic acid
2	C4H8O2	butanoic acid
3	C5H10O2	pentanoic acid
4	C6H12O2	hexanoic 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.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	44
POMD	2 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	48
POMD	3 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	48
POMD	4 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	32

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Effect of temperature on the dilution enthalpies of carboxylic acids in aqueous solutions

Romero, C. M., Suarez, A. F., Lamprecht, I.[Ingolf]

ABSTRACT