Lab-2sh - INTRODUCTION I-Objective To obtain the electrical...

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INTRODUCTION I-Objective:- - To obtain the electrical conductivity of KCl and acetic acid solutions. - Finding out the limiting conductivities 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 cube of a solution which is contained between two parallel electodes 1 cm square and 1 cm apart, 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 -1 The molar coductivity, Λ , can be defined as, Λ = k c / (2) Where, c = the concentration, mol/ cm 3 Λ = the molar conductivity, S cm 2 mol -1 In infinite dilution ( c 0 ), we have the limiting molar conductivity Λ 0 , which can expressed as, Λ 0 = λ 0 + + λ 0 - (3) STRONG ELECTROLYTES

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Lab-2sh - INTRODUCTION I-Objective To obtain the electrical...

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