Liquid junction potential in Weston cadmium cell

In summary, a liquid junction potential in a Weston cadmium cell is a voltage generated by the difference in ion concentration and mobility between two electrolyte solutions. It can affect the accuracy of the cell by interfering with its output and can be minimized by using a salt bridge or porous barrier. The magnitude of the potential can be influenced by factors such as electrolyte type and concentration, temperature, and junction type. To correct for accurate measurements, a known reference cell can be used to measure and subtract the potential difference caused by the liquid junction.
  • #1
Raghav Gupta
1,011
76
Liquid junction potential occurs when 2 solutions of different concentrations are in contact with each other.
The more concentrated one would have tendency to diffuse faster comparitively than less concentrated.
The rate of diffision depends on the mobility of ions.

Weston cadmium cell is hgcl2 Cd cell. In this case how?
 
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  • #2
How what?
 
  • #3
Borek said:
How what?
In Weston cadmium cell what is the concept of liquid junction potential?
 
  • #4
Why do you think it is necessary there?
 

1. What is a liquid junction potential in a Weston cadmium cell?

A liquid junction potential in a Weston cadmium cell is a voltage that is generated at the interface between two electrolyte solutions with different concentrations. It is caused by the difference in ion concentration and mobility between the two solutions.

2. How does a liquid junction potential affect the accuracy of a Weston cadmium cell?

The liquid junction potential can affect the accuracy of a Weston cadmium cell by introducing an additional voltage that can interfere with the measurement of the cell's output. This can result in inaccurate readings and affect the overall reliability of the cell.

3. How can the liquid junction potential in a Weston cadmium cell be minimized?

The liquid junction potential can be minimized by using a salt bridge or a porous barrier to connect the two electrolyte solutions. This allows for a more gradual ion concentration and mobility change, reducing the potential difference at the interface.

4. What factors can influence the magnitude of the liquid junction potential in a Weston cadmium cell?

The magnitude of the liquid junction potential in a Weston cadmium cell can be influenced by factors such as the type and concentration of electrolyte solutions, the temperature, and the type of junction between the solutions (e.g. salt bridge, porous barrier).

5. How can the liquid junction potential in a Weston cadmium cell be corrected for accurate measurements?

The liquid junction potential can be corrected by using a known reference cell to measure the potential difference caused by the liquid junction. This value can then be subtracted from the output of the Weston cadmium cell to obtain a more accurate measurement.

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