I am trying to calculate some speeds for the migration of ions in solution under and electrical field. I have values of ionic mobilities for K+ for example of:

u=7.62E-8 (m**2/sV)

Take a typical voltage of 1.0 for plates separated by 1cm:

E=V/D = 1V/0.01m = 100(V/m)

Using:

speed(m/s) = u E

we have:

s=7.62E-8 x 100 = 7.62E-6 m/s = 7.62E-4 cm/s

To transverse the 1cm plates it would take

1/7.62E-4 = 1300 s or 20 minutes.

Seemed high-Does this sound reasonable?---I guess my intuition is weak here and I found no worked problems in the texts I have!

thanks

Fritz