Answer :
Water will move to the side of the beaker where 3% sodium solution is present from the side where 0.85% sodium solution is present to dilute the sodium on the side of 3% solution through semi-permeable membrane.
What is semi-permeable membrane?
Only some molecules can flow across a semipermeable membrane, which prevents the passage of other molecules. In essence, a semipermeable barrier serves as a filter. Different kinds of semipermeable membranes can filter out molecules of different sizes. A biological or synthetic material can be used to create a semipermeable membrane.
Diffusion is the overall transfer of anything (such as atoms, ions, molecules, or energy) from a region of higher concentration to one of lower concentration. Diffusion is fueled by a gradient in the chemical potential or Gibbs free energy. It is possible for molecules to diffuse "uphill" from a region of lower concentration to one of higher concentration, similar to spinodal breakdown.
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