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Help calculating a diffusion rate using Fick's equation.
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Feb19-12, 09:25 PM
1. The problem statement, all variables and given/known data
Organism weight = 25 g
Organism lenght = 30 cm
[Na+ (ECF)] = 200 mM
[Na+ (water)] = 500 mM
ΔX(gill) = 6 μm
ΔX(skin) = 25 μm
A(gill) = 5.0 cm^2/gm
A(skin) = 10 cm^2/gm
Dk(gill) = 2 X 10^4 cm^2/s
Dk(skin) = 1 X 10^4 cm^2/s
Calculate the Na+ rate of diffusion through the skin using Fick's equation: (Dk)(A)((C1-C2)/dX)
2. Relevant equations
Fick's equation: (Dk)(A)((C1-C2)/dX)
3. The attempt at a solution
I'm not sure too sure if the answer that I'm getting is right. It seems to be too high and the units seem confusing.
Rate = (1 X 10^4)(10)((500-200)/25*10000) = 120 cm^3*mM/s*gm.
I am not sure if I should also use the weight and the length of the organism.
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