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A cell membrane at 37°C is found to be permeable to Ca2+ but not to anions,...

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Chemistry

A cell membrane at 37°C is found to be permeable to Ca2+ but notto anions, and analysis shows the inside concentration to be 0.100M and the outside concentration to be 0.001 M in Ca2+.

a) What potential difference in volts would have to exist acrossthe membrane for Ca2+ to be in equilibrium at the statedconcentrations? Assume that activity coefficients are equal to 1.Give the sign of the potential inside with respect to theoutside.

b) If the measured inside potential is +100 mV with respect tothe outside, what is the minimum (reversible) work required totransfer 1 mol of Ca2+ from outside to inside under theseconditions?

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