2
0
2009
ape
man
1
journal
Original
Apelblat, A.[Alexander]
Manzurola, E.[Emanuel]
J. Chem. Eng. Data
2009
2009-02-25
Cryoscopic and Volumetric Studies in the Maleic Acid + Water System
Freezing points of aqueous solutions of maleic acid were determined. They served to obtain water activities and osmotic and activity coefficients at freezing temperatures. The integration of the Gibbs-Duhem equation was performed by taking into account the dissociation of maleic acid. Densities of (0.09831, 0.4902, and 0.9790) mol * kg-1 maleic acid solutions were measured at 5 K intervals from T ) (288.15 to 333.15) K, and they are compared with the literature results. From the determined densities, the apparent molar volumes, the cubic expansion coefficients, and the second derivatives of volume with respect to temperature which are interrelated with the derivatives of isobaric heat capacities with respect to pressure were evaluated. These derivatives were qualitatively correlated with the changes in the structure of water when maleic acid is dissolved in it.
10.1021/je800357c
54
333-337
1
maleic acid
C4H4O4
1
Commercial source
1
99.7
3
Stated by supplier
2
water
H2O
1
Commercial source
1
99.5
3
Estimated by the compiler
1
1
2
1
Principal objective of the work
RDC
TRC
2/24/2009
1
Solid-liquid equilibrium temperature, K
Visual observation
Liquid
Difference with the reference state, X-X(REF)
Pure solvent at the temperature of the same phase equilibrium
Liquid
2
2
Liquid
Crystal
2
Pressure, kPa
101
3
1
Molality, mol/kg
1
Liquid
2
1
.001
2
1
-.003
1
1
.0014
2
1
-.004
1
1
.0028
2
1
-.008
1
1
.0051
2
1
-.014
2
1
.0075
2
1
-.021
2
1
.0106
3
1
-.031
2
1
.025
3
1
-.076
2
1
.0501
3
1
-.139
3
1
.0769
3
1
-.215
3
1
.1048
4
1
-.269
3
1
.2459
4
1
-.599
3
1
.5177
4
1
-1.168
4
1
.6946
4
1
-1.563
4
1
1.009
4
1
-2.23
3
1
1.404
4
1
-2.99
3
1
1.987
4
1
-4.05
3
1
3.085
4
1
-5.76
3
1
1
2
1
Principal objective of the work
RDC
TRC
2/24/2009
1
Mass density, kg/m3
Vibrating tube method
Liquid
Direct value, X
1
Author
Liquid
Pressure, kPa
101
3
1
Temperature, K
2
Molality, mol/kg
1
Liquid
2
1
288.15
5
2
.09831
4
1
1003.24
6
1
.2
1
293.15
5
2
.09831
4
1
1002.29
6
1
.2
1
298.15
5
2
.09831
4
1
1001.04
6
1
.2
1
303.15
5
2
.09831
4
1
999.59
5
1
.2
1
308.15
5
2
.09831
4
1
997.91
5
1
.2
1
313.15
5
2
.09831
4
1
996.07
5
1
.2
1
318.15
5
2
.09831
4
1
994.03
5
1
.2
1
323.15
5
2
.09831
4
1
991.81
5
1
.2
1
328.15
5
2
.09831
4
1
989.41
5
1
.2
1
333.15
5
2
.09831
4
1
986.88
5
1
.2
1
288.15
5
2
.4902
4
1
1018.5
6
1
.2
1
293.15
5
2
.4902
4
1
1017.26
6
1
.2
1
298.15
5
2
.4902
4
1
1015.79
6
1
.2
1
303.15
5
2
.4902
4
1
1014.1
6
1
.2
1
308.15
5
2
.4902
4
1
1012.25
6
1
.2
1
313.15
5
2
.4902
4
1
1010.18
6
1
.2
1
318.15
5
2
.4902
4
1
1007.98
6
1
.2
1
323.15
5
2
.4902
4
1
1005.58
6
1
.2
1
328.15
5
2
.4902
4
1
1003.01
6
1
.2
1
333.15
5
2
.4902
4
1
1000.36
6
1
.2
1
288.15
5
2
.979
4
1
1035.99
6
1
.2
1
293.15
5
2
.979
4
1
1034.47
6
1
.2
1
298.15
5
2
.979
4
1
1032.74
6
1
.2
1
303.15
5
2
.979
4
1
1030.81
6
1
.2
1
308.15
5
2
.979
4
1
1028.74
6
1
.2
1
313.15
5
2
.979
4
1
1026.46
6
1
.2
1
318.15
5
2
.979
4
1
1024.06
6
1
.2
1
323.15
5
2
.979
4
1
1021.47
6
1
.2
1
328.15
5
2
.979
4
1
1018.75
6
1
.2
1
333.15
5
2
.979
4
1
1015.92
6
1
.2