eable membrane. Observations are made of water-perm the hydrostatic pressure dif

Question

eable membrane. Observations are made of water-perm the hydrostatic pressure differencePH-Pal across the grid at timed intervals with the following results: time PB-PA hours) (cm H20) tube after equilibration Which of the following statcments is truc? A. At 0 hours the osmotic pressue differece nB A 3 m H20. R. At 1 C. At 3 hours the osmolalitics of the fluids in compartments A and B are equal. D. At 3 hours the osmotic pressure of the tluids in compartments A and B are cqual. E. At 2 hours the osmotic pressurc of solution B is 3 cm H20 hour the osrriotic pressur of solution R is cm H2O.

Explanation / Answer

False. The process of osmosis is yet to begin. The osmotic pressure difference is 0 at 0 hour. True. The osmotic pressure of solution B is the observed difference in the height on the two columns, which is 2 cm H2O at 1 hour. False. The process involves the movement of water across the membrane. The solute does not move into solution A. Therefore, level of osmoles no not increase in solution A. Osmolalities cannot be equal in the two solutions. True. The flow of water across the membrane is equal at this point. This means the pressure due to osmosis is equal to the hydrostatic pressure due to the gravity of raised water column in B. True. The difference in height is 3 cm at hour 2. So, the osmotic pressure at this point is 3 cm H2O.

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