Ion Specific Molar Conductivity And Resistance

[leviathanX777]

1. Hi, basically I'm trying to find an equation to find ion specific molar conductivity of salt water flowing between electrodes.

Homework Equations

resistivity: rho = RA/L
conductivity: kappa = 1/rho
conducitivity per unit concentration: lambda = conductivity/concentration

this is ion specific molar conducitivity with units of (s.m^2)/mol

Dunno if this is correct

Also to find the resistance of the ions using conductivity per unit concentration:

gamma = L/lambda A

Where A and L are the area of the electrodes and length respectively. Is this correct or am I totally wrong?

Do ions have resistance associated with them according to their movement?

Thanks!

 

[member 553083]

The equations you have mentioned are correct. Ion specific molar conductivity (lambda) is the conductivity per unit concentration, so it has units of (s.m^2)/mol. To find the resistance of the ions using conductivity per unit concentration, you can use the equation gamma = L/lambda A, where A and L are the area of the electrodes and length respectively.Ions do have resistance associated with them according to their movement. This resistance is caused by the interaction between the ions and the solvent molecules, as well as the ion-ion interactions. This resistance is known as ionic resistance and can be calculated using the Nernst-Einstein equation.