Solution Potential Problems
1.
Calculate the osmotic potential (Ψs) of a 2.4 M sucrose
solution at 24oC. Show your work.
2.
A cell is in equilibrium with its surroundings. The molarity of
the surrounding solution is 0.5M. The temperature is 20 oC
a) Calculate the solute potential of the surrounding solution.
b) Find the water potential of the surrounding solution.
c) What is the water potential of the cytoplasm of the cell?
d) True, false, or not enough information: The cell’s molar
concentration is equal to the molar concentration of the
surrounding solution.
Grid-in Questions
Four beakers made from dialysis tubing were filled with a sucrose solution. Each bag was then immersed
in four beakers containing sucrose solutions of 0.2 M, 0.4 M, 0.6 M, and 0.8 M. After 30 minutes, each
bag was weighed and it change in weight was calculated. All solutions were at 25⁰C. The results are
shown in the following graph:
Determine the solute potential of the dialysis bag to the nearest tenth. Show your work. (2)
A cell is in equilibrium with its surroundings. The molarity of the surrounding solution is 0.8 M Calculate
the solute potential of the surrounding solution.
1. S =
- 1.22 MPa
2.  =
- 1.22 MPa
-
3.  1.22 Mpa
4. C we would need to know the pressure potential of the cell. IF the cell is flaccid, then
molarity is equal to the molarity outside (and so is solute potential). IF the cell is turgid, the
molarity inside is greater than that outside (and the solute potential is lower).