question_answer 49)

Vapour pressure of pure acetone and chloroform at 328 K are 632.8 mm Hg and 741.8 nun Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot ptotal p, pchloroform and Pacetone as a function of xacetone. The experimental data observed for different compositions of mixtures is :  

	0	11.8	23.4	36.0	50.8	58.2	64.5	72.1
	0	54.9	110.1	202.4	322.7	405.9	454.1	521.1
	632.8	548.1	469.4	359.7	257.7	193.6	161.2	120.7

  Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.  

Answer:

 

	0	1.118	0.234	0.360	0.508	0.582	0.645	0.721
	0	54.9	110.1	20.4	322.7	405.9	454.1	521.1
	632.8	548.1	469.4	359.7	257.7	193.6	161.2	120.7
	632.8	603.8	579.5	562.1	580.4	599.4	615.3	641.8

                As the plot for ptotal, dips downwards, hence the solution shows negative deviation from the ideal behaviour.