Which solution will decrease in volume?

1. A semipermeable membrane is placed between the following solutions. Which solution will decrease in volume? Solution A: 1.31% (m/v) starch Solution B: 7.48% (m/v) starch 2.A semipermeable membrane is placed between the following solutions. Which solution will increase in volume? Solution C: 6.75% NaCl Solution D: 11.7% NaCl

Answer

Solution A 1.31% (m/v) starch will decrease in volume.
Solution D 11.7% NaCl will increase in volume.

1. When two solutions are separated by a semi-permeable membrane, the solvent molecules (water molecules) move across the membrane from the solution having low concentration of solute to the solution having high concentration of solute. Solution A has 1.31% starch and solution B has 7.48 % starch. So solution B is the solution of higher concentration. As a result, water molecules will move from solution A to solution B across the membrane. Hence, the volume of solution A will decrease. 2.

Solution C has 6.75 % NaCl and solution D has 11.7% NaCl. So, solution D is having higher concentration and water molecules will move from solution C to solution D. Hence solution D will increase in volume.

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