Homework Help: biology (cell bio)

Posted by t on Saturday, February 9, 2013 at 8:34pm.

Can someone explain the Nernst Equation and its purpose, in as simple terms as possible? For some reason it's just not clicking with me. Thanks!

biology (cell bio) - Devron, Saturday, February 9, 2013 at 8:58pm
The Nernst equation is just used to measure the electrical potential, for the purposes of cell bio, it is used to measure the electrical potential of ions across the cell membrane. The Nernst equation can be written as followed:

E=(RT/zF)ln([K+]o/[K+]i)

[K+]i=ion concentration in cells
[K+]o=ion concentration outside cells
z= is the charge associated with the ion
F=Faraday's equation
R= Constant
T=Temperature in Kelvin
biology (cell bio) - t, Saturday, February 9, 2013 at 9:11pm
Awesome, that makes much more sense. Thank you! My book was rather hard to follow in this section.
biology (cell bio) - Devron, Sunday, February 10, 2013 at 12:44am
Not a problem. Just beware of my typos; F= Faraday's constant, not equation.

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