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