What is a conductivity cell constant? Provide a note on the conductivity cell constant $(G^*)$.

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(N/A) The quantity $\left(\frac{l}{A}\right)$ is called the cell constant,denoted by the symbol $G^*$. Here,$l$ is the distance between the two electrodes of the cell,and $A$ is the area of cross-section of the electrodes. Direct measurement of $l$ and $A$ is often inconvenient and unreliable.
$(A)$ Measurement of cell resistance: The cell constant is usually determined by measuring the resistance of the cell containing a solution whose conductivity is already known. For this purpose,we generally use $KCl$ solutions,whose conductivity is known accurately at various concentrations and temperatures.
$(B)$ Procedure: The conductivity cell is filled with a $KCl$ solution of known concentration and is then connected to a Wheatstone bridge using an $AC$ current source to measure its resistance.
$(C)$ Calculation of cell constant $G^*$: $G^* = \left(\frac{l}{A}\right) = R \cdot \kappa$
Where,$R$ is the measured resistance of the $KCl$ solution,and $\kappa$ is the conductivity of the $KCl$ solution obtained from standard tables.
The table below provides reference values for $KCl$ solutions at $298.15 \ K$:
Molarity (mol $L^{-1}$)Molarity (mol $m^{-3}$)Conductivity $(S \ cm^{-1})$Conductivity $(S \ m^{-1})$Molar Conductivity $(S \ cm^{2} \ mol^{-1})$Molar Conductivity $(S \ m^{2} \ mol^{-1})$
$1.000$$1000$$0.1113$$11.13$$111.3$$111.3 \times 10^{-4}$
$0.100$$100.0$$0.0129$$1.29$$129.0$$129.0 \times 10^{-4}$
$0.010$$10.00$$0.00141$$0.141$$141.0$$141.0 \times 10^{-4}$

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