Backup of Lab 03 new - INTRODUCTION Objective: - To...

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INTRODUCTION Objective: - To determine the electrical conductivity of KCl and acetic acid solutions. - Obtain the limiting conductivities for the two solutions. - To find the dissociation constant of acetic acid. Theory: Substances that are caused to dissociate into ions by the effect of suitable solvents conduct electricity. Therefore, the conductance of these solutions depends on the degree of dissociation and the concentration of ions. The specific conductivity, k , is the conductance of a cube of a solution contained between two parallel electodes 1 cm square and 1 cm apart, and it can be found by : (1) The molar coductivity , Λ , can be defined as, Λ = k c / (2) 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 Strong electrolytes KCl are found to obey the Debye-Huckel- Onsager equation, Λ = Λ 0 - a c (4) 1
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Where , a is a constant. WEAK
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This note was uploaded on 11/07/2010 for the course CHEMICAL E 300 taught by Professor Ahmedghazal during the Spring '10 term at King Fahd University of Petroleum & Minerals.

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Backup of Lab 03 new - INTRODUCTION Objective: - To...

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