Homework Help: Science

Posted by Prisca on Thursday, February 7, 2013 at 1:28pm.

The concentration of k ions inside the nerve cell is about 20 times greater than concentration of these ions outside the nerve cell.what potential difference between outside and inside of the cell would you expect to measure if ths was only due to the concentration difference of potassium ions?

Bio/Biochem/Chem - Devron, Friday, February 8, 2013 at 2:50am
Use the Nernst equation:

E=(RT/zF)ln([K+]o/[K+]i)
Science - Prisca, Friday, February 8, 2013 at 5:45am
Mind illustrating how??
Science - Prisca, Friday, February 8, 2013 at 5:55am
Mind illustrating how??
Bio/Biochem/Chem - Devron, Friday, February 8, 2013 at 5:10pm
Okay, I am assuming that this is at 25º C
R=8.314 J.K-1.mol-1
F=96485 C.mol-1
T=25+273.15
z=+1
[K+]o=1
[K+]i=20

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

E=(8.314 *298/(1*96485)ln(1/20)

E=61ln(1/20)=-183mV
Science - Prisca, Sunday, February 10, 2013 at 10:17am
Thank u so much:)

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