. 2021 Dec 16;11:24081. doi: 10.1038/s41598-021-03212-z

Table 5.

Experimental speed of sounds u data and partial molar isentropic compressibility, $κ_{ϕ}$ values for PTH molalities m_PTH (mole of PTH per 1 kg of ethanol for binary system and mole of PTH per 1 kg of DESs/ethanol solutions for ternary system) in binary PTH/ethanol and ternary PTH/DESs (ChCl:Gly and ChCl:EG)/ethanol solutions at T = (288.15 to 318.15) K and ambient pressure (P = 871 hPa).

m / mol kg^-1	u / m s^-1				10¹⁴ κ_φ / m³ mol^-1 Pa^-1
T / K	288.15	298.15	308.15	318.15	288.15	298.15	308.15	318.15
PTH in Ethanol
0.0206	1178.32	1144.13	1110.23	1077.00	− 2.58	− 4.01	− 5.11	− 6.37
0.0307	1178.93	1144.73	1110.83	1077.55	− 3.30	− 4.68	− 5.94	− 6.95
0.0411	1179.60	1145.40	1111.50	1078.17	− 3.93	− 5.36	− 6.76	− 7.67
0.0525	1180.54	1146.27	1112.28	1078.92	− 5.11	− 6.37	− 7.58	− 8.61
0.0606	1181.12	1146.79	1112.88	1079.45	− 5.49	− 6.63	− 8.22	− 9.15
0.0697	1181.90	1147.49	1113.50	1080.11	− 6.12	− 7.14	− 8.50	− 9.79
PTH in ternary ethanol solution of ChCl:Gly (0.5 mol kg^-1)
0.0000
0.0201	1196.63	1163.50	1130.27	1096.99	− 3.54	− 4.50	− 5.59	− 6.12
0.0293	1197.19	1164.03	1130.75	1097.46	− 3.96	− 4.87	− 5.76	− 6.61
0.0391	1197.90	1164.71	1131.40	1098.03	− 4.84	− 5.87	− 6.85	− 7.59
0.0516	1198.89	1165.61	1132.23	1098.76	− 5.89	− 6.81	− 7.89	− 8.49
0.0585	1199.43	1166.08	1132.70	1099.20	− 6.39	− 7.20	− 8.29	− 9.10
0.0697	1200.35	1166.97	1133.44	1099.90	− 7.15	− 8.16	− 8.97	− 9.85
PTH in ternary ethanol solution of ChCl:Gly (1 mol kg^-1)
0.0000
0.0202	1213.28	1180.84	1147.98	1115.37	− 4.40	− 5.80	− 7.27	− 8.92
0.0306	1214.00	1181.60	1148.70	1116.05	− 4.83	− 6.53	− 7.84	− 9.26
0.0423	1214.82	1182.41	1149.50	1116.90	− 5.33	− 6.91	− 8.31	− 10.10
0.0519	1215.53	1183.14	1150.18	1117.55	− 5.79	− 7.44	− 8.76	− 10.50
0.0596	1216.05	1183.71	1150.75	1118.14	− 5.97	− 7.80	− 9.19	− 11.00
0.0697	1216.87	1184.53	1151.57	1118.90	− 6.53	− 8.41	− 9.80	− 11.53
PTH in ternary ethanol solution of ChCl:Gly (1.5 mol kg^-1)
0.0000
0.0213	1228.92	1196.85	1164.46	1132.73	− 5.13	− 6.80	− 8.44	− 10.16
0.0302	1229.58	1197.54	1165.15	1133.42	− 5.35	− 7.12	− 8.77	− 10.56
0.0387	1230.21	1198.25	1165.82	1134.09	− 5.55	− 7.56	− 9.03	− 10.80
0.0494	1231.05	1199.15	1166.71	1134.93	− 5.97	− 8.03	− 9.54	− 11.25
0.0614	1232.05	1200.16	1167.73	1135.93	− 6.42	− 8.43	− 10.01	− 11.71
0.0700	1232.69	1200.94	1168.45	1136.59	− 6.62	− 8.82	− 10.26	− 11.83
PTH in ternary ethanol solution of ChCl:EG (0.5 mol kg^-1)
0.0000
0.0202	1193.79	1159.65	1126.97	1093.46	− 4.89	− 5.27	− 6.12	− 6.61
0.0306	1194.49	1160.30	1127.55	1093.99	− 5.48	− 5.97	− 6.63	− 7.17
0.0424	1195.37	1161.06	1128.26	1094.64	− 6.40	− 6.68	− 7.44	− 7.99
0.0520	1196.14	1161.74	1128.85	1095.16	− 7.04	− 7.33	− 7.96	− 8.55
0.0609	1196.84	1162.43	1129.43	1095.67	− 7.56	− 8.10	− 8.51	− 9.16
0.0691	1197.58	1163.01	1130.00	1096.21	− 8.32	− 8.57	− 9.10	− 9.84
PTH in ternary ethanol solution of ChCl:EG (1 mol kg^-1)
0.0202	1207.46	1174.89	1142.08	1109.49	− 5.72	− 7.14	− 8.92	− 10.65
0.0306	1208.18	1175.62	1142.80	1110.23	− 6.06	− 7.50	− 9.23	− 11.15
0.0423	1208.98	1176.42	1143.60	1111.03	− 6.33	− 7.79	− 9.44	− 11.42
0.0519	1209.67	1177.11	1144.29	1111.68	− 6.66	− 8.11	− 9.84	− 11.70
0.0596	1210.18	1177.62	1144.81	1112.23	− 6.77	− 8.24	− 10.01	− 11.96
0.0697	1210.86	1178.3	1145.48	1112.91	− 7.04	− 8.45	− 10.14	− 12.15
PTH in ternary ethanol solution of ChCl:EG (1.5 mol kg^-1)
0.0000
0.0198	1220.60	1188.97	1157.02	1123.70	− 6.71	− 8.27	− 10.01	− 12.08
0.0313	1221.53	1189.9	1157.95	1124.63	− 7.25	− 8.68	− 10.54	− 12.59
0.0436	1222.58	1190.95	1159	1125.68	− 7.77	− 9.28	− 11.07	− 13.23
0.0539	1223.44	1191.81	1159.86	1126.54	− 8.01	− 9.56	− 11.36	− 13.57
0.0599	1223.92	1192.29	1160.34	1127.02	− 8.12	− 9.64	− 11.43	− 13.63
0.0683	1224.71	1193.08	1161.13	1127.81	− 8.50	− 10.01	− 11.87	− 14.11

Standard uncertainties (u) for each variable are u (T) = 0.001 K; u (m) = 0.0005 mol kg^-1; u (p) = 10 hPa.

The combined standard uncertainty for the average of n speed of sound measurements u (u) = 1 m s^-1.

Standard uncertainty (u) for DESs composition was estimated to be less than 5·10^–2 mol ratio.

^am is the molality of PTH, mole of PTH per 1 kg of solvents.