1. The problem statement, all variables and given/known data A Na+ ion moves from inside a cell, where the electric potential is -70 mV, to outside the cell, where the potential is 0 V. Uelec = ? eV 2. Relevant equations I thought you would convert -70 mV to V (therefore it would be -.07) and multiply it by 1.6*10e-19 C. But it is rejecting my answer so I don't know what formula to use. 3. The attempt at a solution See above.