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

Table 8 The calculated values of apparent molar volume of DESs (\(V_{\varphi ,DES}\)) and the corresponding partial molar volume (\(\overline{V}_{DES}\)) for the (ChCl/PG DES (molar ratio of 1:3) + water) mixtures at working temperatures^a,b

System
m_DES	\(V_{\varphi ,DES} /\)\((cm^{3} mol^{ - 1} )\)	\(\overline{V}_{DES} /\)\((cm^{3} mol^{ - 1} )\)	\(V_{\varphi ,DES}/(cm^{3} mol^{ - 1} )\)	\(\overline{V}_{DES} /\)\((cm^{3} mol^{ - 1} )\)	\(V_{\varphi ,DES} /\)\((cm^{3} mol^{ - 1} )\)	\(\overline{V}_{DES} /\)\((cm^{3} mol^{ - 1} )\)	\(V_{\varphi ,DES} /\)\((cm^{3} mol^{ - 1} )\)	\(\overline{V}_{DES} /\)\((cm^{3} mol^{ - 1} )\)	\(V_{\varphi ,DES} /\)\((cm^{3} mol^{ - 1} )\)	\(\overline{V}_{DES} /\)\((cm^{3} mol^{ - 1} )\)
0.0213	82.46	82.81	83.18	83.39	83.82	83.92	84.59	84.60	85.10	85.04
0.0467	83.13	83.59	83.71	83.83	84.12	84.18	84.61	84.63	85.02	85.00
0.0775	83.29	83.80	83.76	83.84	84.09	84.14	84.61	84.63	84.89	84.89
0.1155	83.41	83.93	83.87	83.92	84.16	84.20	84.66	84.68	84.95	84.96
0.1638	83.55	84.06	84.03	84.07	84.30	84.32	84.75	84.77	85.06	85.07
0.2271	83.80	84.27	84.21	84.24	84.46	84.48	84.89	84.91	85.14	85.16
0.3137	84.00	84.39	84.39	84.41	84.61	84.63	85.01	85.03	85.24	85.25
0.4394	84.29	84.65	84.65	84.66	84.87	84.88	85.24	85.26	85.46	85.47
0.6381	84.75	86.13	85.11	85.12	85.30	85.30	85.66	85.66	85.84	85.84

^aStandard uncertainty (u) for pressure, temperature, mole fraction of DESs and density is u (P) = 0.5 kPa, u (T) = 0.1 K and u (m_DES) = 0.005 mol kg⁻¹, respectively
^bStandard uncertainty (u) for DESs composition was estimated to be less than 0.05 mol ratios

ISSN: 2661-801X