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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Nitromethane with Heptane and Water
Components:
(1) Nitromethane; CH3NO2 ; [75-52-5]
NIST Chemistry WebBook
for detail
(2) Heptane; C7H16; [142-82-5]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Rezanova, E. N.; A. M. Toikka, and Markuzin, N. P.;Vest Leningr. Univ., Fiz., Khim. 18, 53 (1991).
Variables:
Temperature = 298 K to 333 K
Prepared By:
V. P. Sazonov
Experimental Data:
(Notes on the Nomenclature)
Compositions of three coexisting liquid phases for the system nitromethane + heptane + water
t/°C
T/K
Mass Fraction w
1
(compiler)
Mass Fraction w
2
(compiler)
Mole Fraction x
1
Mole Fraction x
2
Comment(s)
25.0
298.2
0.988
0.003
0.970
0.002
nitromethane-rich phase
30.0
303.2
0.980
0.008
0.958
0.005
nitromethane-rich phase
40.0
313.2
0.971
0.012
0.936
0.007
nitromethane-rich phase
50.0
323.2
0.959
0.020
0.920
0.012
nitromethane-rich phase
60.0
333.2
0.949
0.021
0.904
0.015
nitromethane-rich phase
25.0
298.2
0.020
0.975
0.032
0.941
heptane-rich phase
30.0
303.2
0.024
0.969
0.037
0.925
heptane-rich phase
40.0
313.2
0.028
0.962
0.043
0.903
heptane-rich phase
50.0
323.2
0.032
0.955
0.048
0.885
heptane-rich phase
60.0
333.2
0.035
0.949
0.052
0.865
heptane-rich phase
25.0
298.2
0.106
0.010
0.034
0.002
water-rich phase
30.0
303.2
0.116
0.020
0.038
0.004
water-rich phase
40.0
313.2
0.126
0.034
0.042
0.007
water-rich phase
50.0
323.2
0.138
0.048
0.047
0.010
water-rich phase
60.0
333.2
0.146
0.061
0.051
0.013
water-rich phase
Notes:
Method/Apparatus/Procedure:
The titration method was used. A glass flask with volume 100 mL and a microburette with scale division 0.01 mL were used. Five heterogeneous mixtures of two components were prepared and titrated by the third component until the third liquid phase separated. The solutions were mixed by a magnetic stirrer. The tie lines were plotted across the points obtained by titration. These five points corresponded the five initial solutions. The compositions of three coexisting liquid phases were determined by the crossing of the above mentioned tie lines.
Source and Purity of Materials:
(1) Source not specified, pure grade reagent; dried over CaCl
2
and repeatedly distilled in a laboratory packed column of 20 theoretical plates;b. p. = 101.20 °C;
n
(20 °C, D) = 1.3820.
(2) Source not specified, CP reagent; distilled; b. p. = 98.42 °C;
n
(20 °C, D) = 1.3877.
(3) Twice distilled.
Estimated Errors:
Solubility: ± 0.003 mole fraction.
Temperature: control to ± 0.02 K.