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

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Experiment 7

OBJECT

To find the strength of hydrochloric acid solution (approximately N/10) by titrating it against sodium hydroxide solution conductometrically.

 

images

 

Figure Ex 7.1 Conductance curve of strong acid vs. strong base

THEORY

Conductometry can be used to detect the equivalence point (end point) of a titration. This method is based upon the measurement of conductance during the course of a titration. The Conductance varies differently before and after the equivalence point. This is due to the reason that electrical conductance of a solution depends upon the number of ions present and their ionic mobilities, i.e., speeds.

When conductance ...

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