The solutions in the arms of a U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 mols of glucose and 0.5 mols of sodium chloride (NaCl), and side B is filled with a solution containing 0.8 mols of glucose and 0.4 mols of sodium chloride. Initially, the volume in both arms is the same. Initially at the start of the experiment, which of the following is true? side A is hypertonic to side B side A is hypotonic to side B side A is hypertonic to side B with respect to glucose side A is hypotonic to side B with respect to NaCl After diffusion and equilibrium: How many mols of glucose are on side A? _____ side B?_____ How many mols of NaCl are on side A? _____ side B? _____ C. If you examine side A after three days you should find _____ a decrease in the number of mols of NaCl and glucose and an increase in the water level a decrease in the number of mols of NaCl and a decrease in the water level a decrease in the number of mols of NaCl, an increase in water level, and no change in the number of mols of glucose
A. a hypotonic solution means, a solution in which the total molar concentration of the solutes is less than of the other solution.
the total concentration of side A : 0.9 mols
total concentration of side B : 1.2 mols
hence, side A is hypotonic to side B at the start of the experiment. hence option B.
B. After diffusion and equilibrium, the number of moles of glucose on either side does not change as glucose is not permeable through the membrane.
so the number of moles of glucose on side A: 0.4 mols side B: 0.8 mols
number of moles of NaCl on side A: 0.45 mols side B:0.45 mols
C.the option would be B.
water moves to areas where it is less concentrated, which here is side B
and there would be decrease in the number of moles of NaCl due to diffusion and equilibrium.
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