A semipermeable membrane (SPM) contains an aqueous solution of 0.07 M glucose, a

Question

A semipermeable membrane (SPM) contains an aqueous solution of 0.07 M glucose, and 0.1 M NaCl. It is immersed in a beaker containing a different aqueous solution [0.05 M sucrose, 0.03 M glucose, 0.1 M NaCl]. The SPM allows water and glucose and NaCl to cross, but is completely impermeable to the larger disaccharide sucrose. Circle all that apply Which of the original solutions is isotonic with a normal cell? SPM or beaker Will NaCl cross the SPM? Yes or No Which solute(s) will exhibit a net diffusion into the cell? Sucrose Glucose NaCl Over time, the volume of the bag will increase decrease stay the same

Explanation / Answer

1) Isotonic implies that the concentartion of the solutes in the cell is the same as that outside the cell.

2) Since the concentration of SPM 0.1M is the same inside and outside, it will not cross the SPM.

3) Glucose, since the concentration in the beaker (0.3M) id greater than the concentration (0.1m) in the SPM

4) Since the total concentration remains the same (0.9M) on either side, there will be no net movement of water, hence volume of the bag will stay the same.

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