Resistance of a solution between two electrodes

1. May 9, 2012

jagnala

I have a complex cylindrical shaped beaker with two point electrodes and wanted to calculated the resistance between them?

I know that:
R=ρL/A

But this equation only takes into account the fluid directly between the two electrode and not the remaining fluid in the breaker.

Thanks

2. May 9, 2012

davenn

Hi Jagnala
welcome to PF

I would suspect that the current is going to take the shortest (most direct) path between the 2 electrodes and therefore the resistance of the fluid between those points is the primary consideration.

lets see whay others have to say

cheers
Dave

3. May 9, 2012

256bits

Well, there will ne an electrical field set up between the electrodesd and the ions will drift to one electrode or the other depending on the species.

Here is one take on the subject.
http://www.chem.ox.ac.uk/teaching/Physics%20for%20CHemists/Magnetism/Resistance.html [Broken]

Scroll down to the heading Conductance of Ions in Solution

Last edited by a moderator: May 6, 2017
4. May 10, 2012

Staff: Mentor

Is this a theoretical question, or are you looking for a practical way of finding the result? Because of the geometry these things are difficult to calculate. That's why we start precise conductometric experiments by experimentally determining the cell constant (which is what you are looking for).