ENGINEER 2B03 Lecture Notes - Lecture 2: Activity Coefficient, Exothermic Process, Logarithmic Scale
1 Feb 2018
School
Department
Course
Professor
Document Summary
Most solutions show some deviations from ideality (raoult"s law) In addition to henry"s law, we will examine: Sub-regular solutions convenient to define activity coefficient (important): Fe ni (negative deviation) fe cu (positive deviation) The heat of mixing is not usually zero, and this is reflected in the partial molar free energy of mixing and the heat of mixing according to the following argument. This shows that if the activity coefficient is temperature dependent, then the partial molar free energy of mixing is not zero. So plotting r ln versus 1/t will have a slope of the partial molar free i energy of mixing. Solutions become more ideal as t is raised i i. > 1 (positive deviations) positive slope, positive heat of mixing i decreases with t increase, becomes more ideal. < 1 (negative deviations) negative slope, negative heat of mixing i increases with t increase, becomes more ideal.
