Q 2.37 Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot ptotal, pchloroform, and pacetone as a function of xacetone. The experimental data observed for different compositions of mixture is: Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.
100 xacetone
0
3.4.8
23.4
36.0
50.8
58.2
64.5
72.1
pacetone /mm Hg
0
54.9
110.1
202.4
322.7
405.9
454.1
521.1
pchloroform /mm Hg
632.8
548.1
469.4
359.7
257.7
193.6
161.2
120.7
Q 2.37 Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot ptotal, pchloroform, and pacetone as a function of xacetone. The experimental data observed for different compositions of mixture is: Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.
|
100 xacetone |
0 |
3.4.8 |
23.4 |
36.0 |
50.8 |
58.2 |
64.5 |
72.1 |
|
pacetone /mm Hg |
0 |
54.9 |
110.1 |
202.4 |
322.7 |
405.9 |
454.1 |
521.1 |
|
pchloroform /mm Hg |
632.8 |
548.1 |
469.4 |
359.7 |
257.7 |
193.6 |
161.2 |
120.7 |
The Ptotal for the values given in the graph is found out and plotted in the graph.
ptotal (mm Hg) | 632.8 | 603.0 | 579.5 | 562.1 | 580.4 | 599.5 | 615.3 | 641.8 |

It can be observed from the graph that the plot for the p total of the solution curves downwards. Therefore, the solution shows negative deviation from the ideal behaviour.
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