Explain the difficulties encountered in the measurement of the resistance of ionic solutions and how to resolve them.
(N/A) The inverse of the resistance of an ionic solution is known as its conductance. The relationship is given by $k = \frac{G^{*}}{R}$.
Accurate measurement of an unknown resistance is typically performed using a Wheatstone bridge. However,measuring the resistance of an ionic solution presents two primary difficulties:
$1$. Passing direct current $(DC)$ through the solution causes electrolysis,which changes the chemical composition of the solution.
This difficulty is resolved by using an alternating current $(AC)$ source of power,which prevents electrolysis.
$2$. An ionic solution cannot be connected to the Wheatstone bridge like a metallic wire or other solid conductor.
This problem is solved by using a specially designed vessel known as a conductivity cell.
Accurate measurement of an unknown resistance is typically performed using a Wheatstone bridge. However,measuring the resistance of an ionic solution presents two primary difficulties:
$1$. Passing direct current $(DC)$ through the solution causes electrolysis,which changes the chemical composition of the solution.
This difficulty is resolved by using an alternating current $(AC)$ source of power,which prevents electrolysis.
$2$. An ionic solution cannot be connected to the Wheatstone bridge like a metallic wire or other solid conductor.
This problem is solved by using a specially designed vessel known as a conductivity cell.
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