Question

In direct potentiometry, if I am only given the change in potential measured by an ion selective electrode. How do I calculate the corresponding change in concentration of that ion?

Thanks

Answer 1

you would use the nernst equation, but a modified version.

it would be like E = E* + (RT/nF)ln[ion]

where E* is a constant accounting for all the other potentials

Answer 2

So the change is basically the ratio of concentrations that I get at the end?

Answer 3

no the change is the difference, not the ratio

Answer 4

ok thank you!!

Answer 5

no problem