Measurement of conductivity of solutions

If a solution contains a dissolved substance, its specific conductivity is directly proportional' to the concentration of that substance, so the concentration can be deduced from the conductivity values.


 * $$ R = \rho \frac{l}{q} $$

R = resistance of the conductor during the passage of electricity current, &rho; = resistivity (characteristic for conductor material), l = conductor length (electrode distance in the electrolyte), q = conductor cross-section (area size of electrodes)


 * $$ \frac{1}{R} = \kappa \frac{q}{l} $$

After measuring the resistance of the solution and after experimentally determining the l/q ratio, we can calculate the specific conductivity &kappa; from the relationship.

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