Two solutions are separated by a membrane that is more permeable to water than to sodium. Solution A contains 250 mEq/mL of sodium, and Solution B contains 125 mEq/mL of sodium. Given this, which of the following is TRUE?
A) Active transport is required to move sodium ions from Solution A to Solution B.
B) Water will move from Solution A to Solution B.
C) Water will move from Solution B to Solution A.
D) Sodium ions will diffuse from Solution A to Solution B.

Question

Quizplus · Accepted Answer

Water will move from Solution B to Solution A to balance the concentration of sodium ions, as the membrane is more permeable to water than to sodium, and osmosis drives water towards the higher solute concentration.

Two Solutions Are Separated by a Membrane That Is More