Fig. 4D: Osmosis
Free Water Passing Through Membrane Pores

When an ionic solute such as NaCl dissolves in water, the Na+ ion attracts the partial negative charge of the oxygen atom in the water molecule while the Cl- ion attracts the partial positive charge of the warter's hydrogen. While free, unbound water molecules are small enough to pass through the membranr and through membrane pores, water molecules bound to solute are not.

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