Different Concentrations of Ions on Either Side of a Cell

question 27

Multiple Choice

Different concentrations of ions on either side of a cell membrane constitute a concentration cell, which is described by the Nernst equation given below. What is the electrochemical potential across a membrane when the sodium ion concentration is 0.10 M on one side of the membrane and 0.010 M on the other side, and the temperature is 37°C (body temperature) ? (Given: Na⁺ + e^- a, = -2.71 V; F = 96,485 C; 1 J = 1 C V; R = 8.315 J / mol K)

• A) 61.5 mV
• B) 26.7 mV
• C) 2.65 V
• D) 2.68 V
• E) 2.98 V

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Definitions:

Lurking Variable

A variable that is not explicitly included in a model but influences both the independent and dependent variables, potentially confounding the results.

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