Thermodynamic investigation on the aqueous mixtures of choline chloride/propylene glycol deep eutectic solvent at T = (293.15 to 313.15) K

Table 6 The dependence of \(V^{E}\) values on DES mole fractions at operational temperatures for pseudo-binary mixtures of ChCl/PG DES (molar ratio of 1:3) in water

x_DES	T = 293.2 K	T = 298.2 K	T = 303.2 K	T = 308.2 K	T = 313.2 K
	V^E/cm⁻³ mol⁻¹	V^E/cm⁻³ mol⁻¹	V^E/cm⁻³ mol⁻¹	V^E/cm⁻³ mol⁻¹	V^E/cm⁻³ mol⁻¹
0.0000	0.0000	0.0000	0.0000	0.0000	0.0000
0.0237	− 0.0627	− 0.0541	− 0.0438	− 0.0343	− 0.0269
0.0516	− 0.1057	− 0.0935	− 0.0818	− 0.0739	− 0.0623
0.0853	− 0.1628	− 0.1512	− 0.1378	− 0.1230	− 0.1133
0.1264	− 0.2293	− 0.2135	− 0.1982	− 0.1777	− 0.1627
0.1775	− 0.3028	− 0.2766	− 0.2587	− 0.2369	− 0.2124
0.2452	− 0.3624	− 0.3418	− 0.3207	− 0.2972	− 0.2764
0.3355	− 0.4389	− 0.4148	− 0.3967	− 0.3710	− 0.3514
0.4601	− 0.4865	− 0.4663	− 0.4431	− 0.4186	− 0.3957
0.6609	− 0.4105	− 0.3839	− 0.3694	− 0.3456	− 0.3283
1.0000	0.0000	0.0000	0.0000	0.0000	0.0000

a Standard uncertainties (u) are u(T) = 0.1 K, u(p) = 0.5 kPa, u(x_DES) = 0.005 and the average combined expanded uncertainties U_c (level of confidence = 0.95, k = 2) is U_c(V^E) = 0.006 × 10⁶ m³ mol⁻¹

ISSN: 2661-801X