## Hmwk 14.101

$E_{cell} = E_{cell}^{\circ}-\frac{RT}{nF}\ln Q$

kshalbi
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### Hmwk 14.101

The question says that in a neuron the [K+] of ions in the cell is 20-30 times as great as that outside. The solutions manual, when using the nernst equation, writes the ln part as ln (1/30). How would I know to write it that way as opposed to ln (30/1) ?

Chem_Mod
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### Re: Hmwk 14.101

Q = [p]/[r]. Since the concentration is greater inside the neuron, we expect that K+ ions will flow from inside to outside. That makes the inside the reactant and outside the product. Therefore you have Q=1/30.

kshalbi
Posts: 68
Joined: Fri Sep 25, 2015 3:00 am

### Re: Hmwk 14.101

Ohhhhhhhhhh. I see. Thank you!

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