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.
Explore More
Similar Questions
Which of the following cannot be used as a standard solution for the determination of the cell constant of a conductivity cell?
At $298 \text{ K}$, the specific conductance $(\kappa)$ of a $0.0020 \text{ M}$ $NaCl$ solution is $2.50 \times 10^{-4} \text{ S cm}^{-1}$. Calculate the molar conductivity $(\Lambda_m)$ of the solution in $\text{S cm}^2 \text{mol}^{-1}$.
DifficultMHT CET 2026
View SolutionWhat is the $SI$ unit of resistivity?
The equivalent conductances of two strong electrolytes at infinite dilution in $H_2O$ (where ions move freely through a solution) at $25 ^\circ C$ are given below:
$\Lambda _{CH_3COONa}^o = 91.0 \ S \ cm^2 / equiv.$
$\Lambda _{HCl}^o = 426.2 \ S \ cm^2 / equiv.$
What additional information/quantity one needs to calculate $\Lambda ^o$ of an aqueous solution of acetic acid?
$\Lambda _{CH_3COONa}^o = 91.0 \ S \ cm^2 / equiv.$
$\Lambda _{HCl}^o = 426.2 \ S \ cm^2 / equiv.$
What additional information/quantity one needs to calculate $\Lambda ^o$ of an aqueous solution of acetic acid?
The specific conductivity of $N/10$ $KCl$ solution at $20\,^oC$ is $0.0212\,ohm^{-1}\,cm^{-1}$ and the resistance of the cell containing this solution at $20\,^oC$ is $55\,ohm$. The cell constant is ............. $cm^{-1}$.
MediumAIIMS 1999
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo