# Question 21.1: The concentration of Na^+ inside a squid axon is 0.050 M (50...

The concentration of $Na^{+}$ inside a squid axon is 0.050 M (50 mM), in comparison with $[Na^{+}] = 0.440 M (440 mM)$ in the fluid surrounding the cell.

a. Calculate the equilibrium potential $E_{ion}$ for the $Na^{+}$ ion at 310 K.
b. If the membrane potential $E_{membrane} = –0.050 V$, is the transport of $Na^{+}$ from inside to outside the cell membrane spontaneous?

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