1. Water Potential
Learning Targets
I can explain what water potential is and how it is impacted by Ψs and Ψp.
I can design an experiment to determine the concentration of solutes in a living cell.
Ψ =Ψs +Ψp
Ψ s= -iCRT

2. Water potential Solute potentinal of pure water is 0
As solutes are added to water what happens to the solute potential?
Pressure potential does not exist in animal cells, what structure provides this in plant cells?

3. \

4. Potato cells in pure water…

5. Plant cell in a solution with solutes…
What happened to the plant cell after it was placed in this solution?

6. Solute potential = -iCRT
Inside cell: i = 2 (Na and Cl ions both form in solution)
C = 0.15M R = liter bars/moles K T = = 298K
-7.4 bars
Outside cell ; All is the same except for C = 0.1M
-4.9 bars
Water moves from higher water potential to lower water potential….therefore it moves into the cell.
+2.5 bars

7. How will you determine the solute potential of your potato cells?