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 x1 and applying the conditions of infinite dilution we get,  By Antonie equation  The quantity is calculated experimentally by plotting T vs x1

Ebulliometer

• It is a device which is used for precise and simultaneous measurement
• f 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.

Thank you