In normal human extracellular fluid, the concentration of Na+ is approximately 140 mEq/L. A beaker of water is filled with a solution with exactly that sodium concentration. If a water-permeable synthetic cell is dropped in the beaker, what NaCl concentration can it have and still lose water to its environment?
I understand that the concentration in the cell has to be less than outside of the cell, for water to move out of the cell. But the answer says [NaCl] < 70 mEq/L. Is this because if we have 70 NaCl mEq/L it breaks down to 70 mEq/L of Na+ and 70 mEq/L of Cl-, making the total concentration 140?
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