2
0
2010
lin
sor
0
journal
Original
Lin, P.-Y.[Pei-Yin]
Soriano, A. N.[Allan N.]
Leron, R. B.[Rhoda B.]
Li, M.-H.[Meng-Hui]
J. Chem. Thermodyn.
2010
2020-09-29
Electrolytic conductivity and molar heat capacity of two aqueous solutions of ionic liquids at room-temperature: Measurements and correlations
As part of our systematic study on physicochemical characterization of ionic liquids, in this work, we report new measurements of electrolytic conductivity and molar heat capacity for aqueous solutions of two 1-ethyl-3-methylimidazolium-based ionic liquids, namely: 1-ethyl-3-methylimidazolium dicyanamide and 1-ethyl-3-methylimidazolium 2-(2-methoxyethoxy) ethylsulfate, at normal atmospheric condition and for temperatures up to 353.2 K. The electrolytic conductivity and molar heat capacity were measured by a commercial conductivity meter and a differential scanning calorimeter (DSC), respectively. The estimated experimental uncertainties for the electrolytic conductivity and molar heat capacity measurements were +-1 % and +-2 %, respectively. The property data are reported as functions of temperature and composition. A modified empirical equation from another researcher [1] was used to correlate the temperature and composition dependence of our electrolytic conductivity results. An excess molar heat capacity expression derived using a Redlich-Kister type equation was used to represent the temperature and composition dependence of the measured molar heat capacity and calculated excess molar heat capacity of the solvent systems considered. The correlations applied represent our measurements satisfactorily as shown by an acceptable overall average deviation of 6.4 % and 0.1 %, respectively, for electrolytic conductivity and molar heat capacity.
Aqueous ionic liquid solution
Electrolytic conductivity
1-Ethyl-3-methylimidazolium 2-(2-methoxyethoxy) ethylsulfate
1-Ethyl-3-methylimidazolium dicyanamide
Molar heat capacity
10.1016/j.jct.2010.03.017
8
42
994-998
1
InChI=1S/C6H11N2.C2N3/c1-3-8-5-4-7(2)6-8;3-1-5-2-4/h4-6H,3H2,1-2H3;/q+1;-1
MKHFCTXNDRMIDR-UHFFFAOYSA-N
1-ethyl-3-methylimidazolium dicyanamide
C8H11N5
1
Commercial source
1
99.9
3
Stated by supplier
2
0.05
1
DSC
2
InChI=1S/C6H11N2.C5H12O6S/c1-3-8-5-4-7(2)6-8;1-9-2-3-10-4-5-11-12(6,7)8/h4-6H,3H2,1-2H3;2-5H2,1H3,(H,6,7,8)/q+1;/p-1
YWHZQHRLNXKZNA-UHFFFAOYSA-M
1-ethyl-3-methylimidazolium 2-(2-methoxyethoxy) ethylsulfate
1-ethyl-3-methylimidazolium diethyleneglycol monomethylethersulfate
1-ethyll-3-methylimidazolium 2-(2-methoxyethoxy)ethyl sulfate
C11H22N2O6S
1
Commercial source
1
98.2
3
Stated by supplier
2
0.2
1
DSC
3
InChI=1S/H2O/h1H2
XLYOFNOQVPJJNP-UHFFFAOYSA-N
water
H2O
1
Commercial source
1
99.9
3
Estimated by the compiler
1
3
1
1
1
Principal objective of the work
PW
TRC
10/7/2010
1
Molar heat capacity at constant pressure, J/K/mol
Small sample (50 mg) DSC
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101
3
1
Mole fraction
1
Liquid
2
Temperature, K
Liquid
1
0.2
2
2
293.2
4
1
5.69
3
1
0.25
1
0.2
2
2
298.2
4
1
6.41
3
1
0.28
1
0.2
2
2
303.2
4
1
7.2
3
1
0.31
1
0.2
2
2
308.2
4
1
8
3
1
0.35
1
0.2
2
2
313.2
4
1
8.83
3
1
0.38
1
0.2
2
2
318.2
4
1
9.63
3
1
0.41
1
0.2
2
2
323.2
4
1
10.5
4
1
0.45
1
0.2
2
2
328.2
4
1
11.37
4
1
0.49
1
0.2
2
2
333.2
4
1
12.22
4
1
0.52
1
0.2
2
2
338.2
4
1
13.07
4
1
0.56
1
0.2
2
2
343.2
4
1
13.93
4
1
0.6
1
0.2
2
2
348.2
4
1
14.81
4
1
0.63
1
0.2
2
2
353.2
4
1
15.64
4
1
0.67
1
0.4
2
2
293.2
4
1
4.47
3
1
0.19
1
0.4
2
2
298.2
4
1
5.06
3
1
0.22
1
0.4
2
2
303.2
4
1
5.7
3
1
0.25
1
0.4
2
2
308.2
4
1
6.36
3
1
0.28
1
0.4
2
2
313.2
4
1
7.03
3
1
0.3
1
0.4
2
2
318.2
4
1
7.73
3
1
0.33
1
0.4
2
2
323.2
4
1
8.42
3
1
0.36
1
0.4
2
2
328.2
4
1
9.14
3
1
0.39
1
0.4
2
2
333.2
4
1
9.85
3
1
0.42
1
0.4
2
2
338.2
4
1
10.57
4
1
0.45
1
0.4
2
2
343.2
4
1
11.27
4
1
0.48
1
0.4
2
2
348.2
4
1
12
4
1
0.51
1
0.4
2
2
353.2
4
1
12.74
4
1
0.54
1
0.6
2
2
293.2
4
1
3.47
3
1
0.15
1
0.6
2
2
298.2
4
1
3.91
3
1
0.17
1
0.6
2
2
303.2
4
1
4.4
3
1
0.19
1
0.6
2
2
308.2
4
1
4.91
3
1
0.21
1
0.6
2
2
313.2
4
1
5.43
3
1
0.23
1
0.6
2
2
318.2
4
1
5.97
3
1
0.26
1
0.6
2
2
323.2
4
1
6.52
3
1
0.28
1
0.6
2
2
328.2
4
1
7.08
3
1
0.3
1
0.6
2
2
333.2
4
1
7.65
3
1
0.33
1
0.6
2
2
338.2
4
1
8.22
3
1
0.35
1
0.6
2
2
343.2
4
1
8.81
3
1
0.38
1
0.6
2
2
348.2
4
1
9.42
3
1
0.4
1
0.6
2
2
353.2
4
1
10.04
4
1
0.43
1
0.8
2
2
293.2
4
1
2.72
3
1
0.12
1
0.8
2
2
298.2
4
1
3.09
3
1
0.13
1
0.8
2
2
303.2
4
1
3.48
3
1
0.15
1
0.8
2
2
308.2
4
1
3.89
3
1
0.17
1
0.8
2
2
313.2
4
1
4.32
3
1
0.19
1
0.8
2
2
318.2
4
1
4.77
3
1
0.21
1
0.8
2
2
323.2
4
1
5.25
3
1
0.23
1
0.8
2
2
328.2
4
1
5.74
3
1
0.25
1
0.8
2
2
333.2
4
1
6.22
3
1
0.27
1
0.8
2
2
338.2
4
1
6.71
3
1
0.29
1
0.8
2
2
343.2
4
1
7.26
3
1
0.31
1
0.8
2
2
348.2
4
1
7.79
3
1
0.33
1
0.8
2
2
353.2
4
1
8.36
3
1
0.36
2
3
1
1
1
Principal objective of the work
PW
TRC
10/7/2010
1
Electrical conductivity, S/m
Alternating current cell with electrodes
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101
3
1
Temperature, K
Liquid
2
Mole fraction
1
Liquid
1
293.2
4
2
0.2
2
1
5.69
3
1
0.13
1
293.2
4
2
0.4
2
1
4.47
3
1
0.1
1
293.2
4
2
0.6
2
1
3.47
3
1
0.08
1
293.2
4
2
0.8
2
1
2.72
3
1
0.06
1
298.2
4
2
0.2
2
1
6.41
3
1
0.14
1
298.2
4
2
0.4
2
1
5.06
3
1
0.11
1
298.2
4
2
0.6
2
1
3.91
3
1
0.09
1
298.2
4
2
0.8
2
1
3.09
3
1
0.07
1
303.2
4
2
0.2
2
1
7.2
3
1
0.16
1
303.2
4
2
0.4
2
1
5.7
3
1
0.13
1
303.2
4
2
0.6
2
1
4.4
3
1
0.1
1
303.2
4
2
0.8
2
1
3.48
3
1
0.08
1
308.2
4
2
0.2
2
1
8
3
1
0.17
1
308.2
4
2
0.4
2
1
6.36
3
1
0.14
1
308.2
4
2
0.6
2
1
4.91
3
1
0.11
1
308.2
4
2
0.8
2
1
3.89
3
1
0.08
1
313.2
4
2
0.2
2
1
8.83
3
1
0.19
1
313.2
4
2
0.4
2
1
7.03
3
1
0.15
1
313.2
4
2
0.6
2
1
5.43
3
1
0.12
1
313.2
4
2
0.8
2
1
4.32
3
1
0.09
1
318.2
4
2
0.2
2
1
9.63
3
1
0.2
1
318.2
4
2
0.4
2
1
7.73
3
1
0.16
1
318.2
4
2
0.6
2
1
5.97
3
1
0.13
1
318.2
4
2
0.8
2
1
4.77
3
1
0.1
1
323.2
4
2
0.2
2
1
10.5
4
1
0.22
1
323.2
4
2
0.4
2
1
8.42
3
1
0.18
1
323.2
4
2
0.6
2
1
6.52
3
1
0.14
1
323.2
4
2
0.8
2
1
5.25
3
1
0.11
1
328.2
4
2
0.2
2
1
11.37
4
1
0.24
1
328.2
4
2
0.4
2
1
9.14
3
1
0.19
1
328.2
4
2
0.6
2
1
7.08
3
1
0.15
1
328.2
4
2
0.8
2
1
5.74
3
1
0.12
1
333.2
4
2
0.2
2
1
12.22
4
1
0.25
1
333.2
4
2
0.4
2
1
9.85
3
1
0.21
1
333.2
4
2
0.6
2
1
7.65
3
1
0.16
1
333.2
4
2
0.8
2
1
6.22
3
1
0.13
1
338.2
4
2
0.2
2
1
13.07
4
1
0.27
1
338.2
4
2
0.4
2
1
10.57
4
1
0.22
1
338.2
4
2
0.6
2
1
8.22
3
1
0.17
1
338.2
4
2
0.8
2
1
6.71
3
1
0.14
1
343.2
4
2
0.2
2
1
13.93
4
1
0.29
1
343.2
4
2
0.4
2
1
11.27
4
1
0.23
1
343.2
4
2
0.6
2
1
8.81
3
1
0.18
1
343.2
4
2
0.8
2
1
7.26
3
1
0.15
1
348.2
4
2
0.2
2
1
14.81
4
1
0.3
1
348.2
4
2
0.4
2
1
12
4
1
0.25
1
348.2
4
2
0.6
2
1
9.42
3
1
0.19
1
348.2
4
2
0.8
2
1
7.79
3
1
0.16
1
353.2
4
2
0.2
2
1
15.64
4
1
0.32
1
353.2
4
2
0.4
2
1
12.74
4
1
0.26
1
353.2
4
2
0.6
2
1
10.04
4
1
0.22
1
353.2
4
2
0.8
2
1
8.36
3
1
0.17
3
3
1
2
1
Principal objective of the work
PW
TRC
10/7/2010
1
Molar heat capacity at constant pressure, J/K/mol
Small sample (50 mg) DSC
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101
3
1
Mole fraction
2
Liquid
2
Temperature, K
Liquid
1
0.2
2
2
293.2
4
1
0.82
2
1
0.04
1
0.2
2
2
298.2
4
1
0.99
2
1
0.04
1
0.2
2
2
303.2
4
1
1.18
3
1
0.05
1
0.2
2
2
308.2
4
1
1.4
3
1
0.06
1
0.2
2
2
313.2
4
1
1.63
3
1
0.07
1
0.2
2
2
318.2
4
1
1.87
3
1
0.08
1
0.2
2
2
323.2
4
1
2.12
3
1
0.09
1
0.2
2
2
328.2
4
1
2.39
3
1
0.1
1
0.2
2
2
333.2
4
1
2.68
3
1
0.12
1
0.2
2
2
338.2
4
1
2.97
3
1
0.13
1
0.2
2
2
343.2
4
1
3.28
3
1
0.14
1
0.2
2
2
348.2
4
1
3.59
3
1
0.15
1
0.2
2
2
353.2
4
1
3.93
3
1
0.17
1
0.4
2
2
293.2
4
1
0.42
2
1
0.02
1
0.4
2
2
298.2
4
1
0.51
2
1
0.02
1
0.4
2
2
303.2
4
1
0.63
2
1
0.03
1
0.4
2
2
308.2
4
1
0.76
2
1
0.03
1
0.4
2
2
313.2
4
1
0.9
2
1
0.04
1
0.4
2
2
318.2
4
1
1.06
3
1
0.05
1
0.4
2
2
323.2
4
1
1.22
3
1
0.05
1
0.4
2
2
328.2
4
1
1.4
3
1
0.06
1
0.4
2
2
333.2
4
1
1.58
3
1
0.07
1
0.4
2
2
338.2
4
1
1.77
3
1
0.08
1
0.4
2
2
343.2
4
1
1.96
3
1
0.08
1
0.4
2
2
348.2
4
1
2.17
3
1
0.09
1
0.4
2
2
353.2
4
1
2.39
3
1
0.11
1
0.6
2
2
293.2
4
1
0.24
2
1
0.01
1
0.6
2
2
298.2
4
1
0.3
2
1
0.01
1
0.6
2
2
303.2
4
1
0.38
2
1
0.02
1
0.6
2
2
308.2
4
1
0.47
2
1
0.02
1
0.6
2
2
313.2
4
1
0.57
2
1
0.03
1
0.6
2
2
318.2
4
1
0.68
2
1
0.03
1
0.6
2
2
323.2
4
1
0.79
2
1
0.04
1
0.6
2
2
328.2
4
1
0.92
2
1
0.04
1
0.6
2
2
333.2
4
1
1.06
3
1
0.05
1
0.6
2
2
338.2
4
1
1.2
3
1
0.05
1
0.6
2
2
343.2
4
1
1.35
3
1
0.06
1
0.6
2
2
348.2
4
1
1.51
3
1
0.07
1
0.6
2
2
353.2
4
1
1.68
3
1
0.08
1
0.8
2
2
293.2
4
1
0.24
2
1
0.01
1
0.8
2
2
298.2
4
1
0.3
2
1
0.01
1
0.8
2
2
303.2
4
1
0.38
2
1
0.02
1
0.8
2
2
308.2
4
1
0.47
2
1
0.02
1
0.8
2
2
313.2
4
1
0.57
2
1
0.03
1
0.8
2
2
318.2
4
1
0.68
2
1
0.03
1
0.8
2
2
323.2
4
1
0.79
2
1
0.04
1
0.8
2
2
328.2
4
1
0.92
2
1
0.04
1
0.8
2
2
333.2
4
1
1.06
3
1
0.05
1
0.8
2
2
338.2
4
1
1.2
3
1
0.05
1
0.8
2
2
343.2
4
1
1.35
3
1
0.06
1
0.8
2
2
348.2
4
1
1.51
3
1
0.07
1
0.8
2
2
353.2
4
1
1.68
3
1
0.07
4
3
1
2
1
Principal objective of the work
PW
TRC
10/7/2010
1
Electrical conductivity, S/m
Alternating current cell with electrodes
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101
3
1
Temperature, K
Liquid
2
Mole fraction
2
Liquid
1
293.2
4
2
0.2
2
1
0.82
2
1
0.02
1
293.2
4
2
0.4
2
1
0.42
2
1
0.01
1
293.2
4
2
0.6
2
1
0.24
2
1
0.01
1
293.2
4
2
0.8
2
1
0.19
2
1
0.01
1
298.2
4
2
0.2
2
1
0.99
2
1
0.03
1
298.2
4
2
0.4
2
1
0.51
2
1
0.01
1
298.2
4
2
0.6
2
1
0.3
2
1
0.01
1
298.2
4
2
0.8
2
1
0.23
2
1
0.01
1
303.2
4
2
0.2
2
1
1.18
3
1
0.03
1
303.2
4
2
0.4
2
1
0.63
2
1
0.02
1
303.2
4
2
0.6
2
1
0.38
2
1
0.01
1
303.2
4
2
0.8
2
1
0.3
2
1
0.01
1
308.2
4
2
0.2
2
1
1.4
3
1
0.03
1
308.2
4
2
0.4
2
1
0.76
2
1
0.02
1
308.2
4
2
0.6
2
1
0.47
2
1
0.01
1
308.2
4
2
0.8
2
1
0.38
2
1
0.01
1
313.2
4
2
0.2
2
1
1.63
3
1
0.04
1
313.2
4
2
0.4
2
1
0.9
2
1
0.02
1
313.2
4
2
0.6
2
1
0.57
2
1
0.02
1
313.2
4
2
0.8
2
1
0.46
2
1
0.01
1
318.2
4
2
0.2
2
1
1.87
3
1
0.04
1
318.2
4
2
0.4
2
1
1.06
3
1
0.03
1
318.2
4
2
0.6
2
1
0.68
2
1
0.02
1
318.2
4
2
0.8
2
1
0.56
2
1
0.02
1
323.2
4
2
0.2
2
1
2.12
3
1
0.05
1
323.2
4
2
0.4
2
1
1.22
3
1
0.03
1
323.2
4
2
0.6
2
1
0.79
2
1
0.02
1
323.2
4
2
0.8
2
1
0.67
2
1
0.02
1
328.2
4
2
0.2
2
1
2.39
3
1
0.05
1
328.2
4
2
0.4
2
1
1.4
3
1
0.03
1
328.2
4
2
0.6
2
1
0.92
2
1
0.02
1
328.2
4
2
0.8
2
1
0.79
2
1
0.02
1
333.2
4
2
0.2
2
1
2.68
3
1
0.06
1
333.2
4
2
0.4
2
1
1.58
3
1
0.04
1
333.2
4
2
0.6
2
1
1.06
3
1
0.02
1
333.2
4
2
0.8
2
1
0.92
2
1
0.02
1
338.2
4
2
0.2
2
1
2.97
3
1
0.06
1
338.2
4
2
0.4
2
1
1.77
3
1
0.04
1
338.2
4
2
0.6
2
1
1.2
3
1
0.03
1
338.2
4
2
0.8
2
1
1.05
3
1
0.02
1
343.2
4
2
0.2
2
1
3.28
3
1
0.07
1
343.2
4
2
0.4
2
1
1.96
3
1
0.04
1
343.2
4
2
0.6
2
1
1.35
3
1
0.03
1
343.2
4
2
0.8
2
1
1.2
3
1
0.03
1
348.2
4
2
0.2
2
1
3.59
3
1
0.08
1
348.2
4
2
0.4
2
1
2.17
3
1
0.05
1
348.2
4
2
0.6
2
1
1.51
3
1
0.03
1
348.2
4
2
0.8
2
1
1.36
3
1
0.03
1
353.2
4
2
0.2
2
1
3.93
3
1
0.08
1
353.2
4
2
0.4
2
1
2.39
3
1
0.06
1
353.2
4
2
0.6
2
1
1.68
3
1
0.04
1
353.2
4
2
0.8
2
1
1.51
3
1
0.03