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Pharmaceutical Physical Chemistry: Theory and Practices by S. K. Bhasin

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Experiment 6

OBJECT

To determine the dissociation constant of acetic acid and verify Ostwald’s dilution law.

APPARATUS AND REAGENTS

Conductometer, burette, pipette, beaker, volumetric flask (100 ml), acetic acid, conductivity water.

THEORY

Suppose a weak electrolyte AB dissociates in V litre of solution with initial concentration of one mole per litre. At equilibrium, its concentration will be as under:

 

images

 

where a is degree of dissociation.

On applying the law of mass action, we get

 

images

 

where K is the dissociation constant of the substance. ...

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