THE `INFINITE DILUTION ACTIVITY COEFFICIENT' (IDAC) Instructor : - PowerPoint PPT Presentation

EBULLIOMETRIC DETERMINATION OF THE `INFINITE DILUTION ACTIVITY COEFFICIENT' (IDAC) Instructor : Prof. Yogendra Shashtri TAs : Prawal Agarwal Sahil Narang Swagnik Ghosh

AIM To determine "Infinite Dilution Activity Coefficient"  (IDAC) of a binary mixture at atmospheric pressure using differential ebulliometry and the limiting slope method. To estimate the parameters in the activity coefficients  correlations such as Van Laar/Wilson.

Infinite Dilution Activity Coefficient (IDAC)  At infinite dilution maximum deviation from ideality occurs.  Indicator of the degree of the non-ideality of the solution.  Phase equilibrium calculation can be performed using IDAC.  Parameters of activity coefficient model can be determined.

Theory of IDAC  Assuming Ideal Vapour Phase and Negligible Poynting correction (Poynting factor = 1)  Differentiating with respect to x 1 and applying the conditions of infinite dilution we get,  By Antonie equation  The quantity is calculated experimentally by plotting T vs x 1

Ebulliometer  It is a device which is used for precise and simultaneous measurement of both, the bubble point of a liquid and the dew point of the vapour

Procedure

Procedure

Procedure  Repeat the above steps for other dilute (complementary experiment carried by other group).  Check for +ve or – ve deviation from Raoults law.  Determine Van Laar or Wilson’s parameters and compare with literature data, if available.  Remember: To bring your calculators.

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