Given what we know about membrane polarization, we can confirm that If you experimentally increase the concentration of Na outside a cell while maintaining other ion concentrations as they were, the cells membrane potential would increase and be positively charged.
Increasing the concentration of Na outside a cell would cause there to be an increase and a build-up of positive charges outside of the cell. Due to the fact that the ion concentrations inside the cell remain constant, we can confirm that there will be a net positive charge on the outside of the cell and this will cause an increase in the membrane's potential.
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