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KING FAHD UNIVERSITY OF PETROLEUM & MINERALS CHEMISTRY DEPARTMENT EXPERIMENTS IN PHYSICAL CHEMISTRY CHEM-311 Pr epar ed For Dr. M . I . W azeer EX P # 3 DETERMINATION OF DIFFUSSION POTENTIAL DONE BY: Al-Ghamdi, Kamal S. ID#: 901432 SEC.#: 56 Date O f Performance : 20- 3- 1996 Date O f Subm iss ion : 27- 3- 1996
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INTRODUCTION I-Objective:- -To determine the factor RT F from potential by using permeable membrane. -To determine the ionic mobilities of cations and onions by using a cellophane membrane. II-Theory:- The potential difference which is known as the Nernst potential is two electrolyte solutions of different concentrations separated by a membrane. If we have two KCl solutions were separated by a cation permeable membrane, some K - ions cross from the more concentrated side to the less concentrated one, and as a result the left hand side will have a negative potential with respect to the other side, resulting in a Nernst potential which exactly balance the tendency of the concentration to become equal. The Gibbs energy difference, G e is :- G e = z F ∆Φ where, z = The charge on the permeable ions (z=1 in our case). Gibbs energy arising from the concentration difference is :- G = R T ln C C 2 1 At equilibrium G = 0 and therefore :- G = G e + G c = 0 ∆Φ = RT zF ln C C 2 1
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