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lab1 chem311 - KING FAHD UNIVERSITY OF PETROLEUM MINERALS...

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KING FAHD UNIVERSITY OF PETROLEUM & MINERALS CHEMISTRY DEPARTMENT EXPERIMENTS IN PHYSICAL CHEMISTRY CHEM-311 Prepared For Prof. M. I. Wazeer EXP # 2 CONDUCTIVITY OF STRONG & WEAK ELECTROLYTES DON E BY : Al - K h a t e e b .W a l e e d I D# : 9 14 9 0 7 SEC.#: 56 Date Of Performance: 30-9-1996 Date Of Submission: 7-10-1996 1
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INTRODUCTION I-Objective :- - To obtain the electrical conductivity of KCl and acetic acid solutions. - Finding out the limiting conductivity for the two solutions. - To find the dissociation constant of acetic acid. II-Theory :- Some substances that dissociate into ions by some suitable solvents can conduct electricity. Therefore, the conductance of these solutions depends on the degree of dissociation and the concentration of ions. The electrical conductivity, k , is the conductance of a unit cube of a solution which is contained between two parallel electrodes 1 cm square and 1 cm apart. For particular case of a solution of an electrolyte, it known as the electrolytic conductivity and it can be found by: k G l A = (1) Where, G = the conductance, S l = the length of material, cm A = the cross-sectional area, cm 2 K = the electrical conductivity, S cm The molar conductivity, Λ , can be defined as, Λ = k c / (2)
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