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Water Potential

Water Potential. WATER POTENTIAL. Water potential measures water’s tendency to leave one place in favor of another. Calculating water potential. Ѱ s + Ѱ p = Ѱ Solute potential Adding solute decreases water potential Pressure potential Increasing pressure increases water potential.

margaret-william
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Water Potential

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  1. Water Potential

  2. WATER POTENTIAL • Water potential measures water’s tendency to leave one place in favor of another

  3. Calculating water potential • Ѱs + Ѱp = Ѱ • Solute potential • Adding solute decreases water potential • Pressure potential • Increasing pressure increases water potential

  4. Ѱs=-iCRT • i=ionization constant (number of ions solute forms in water) • C=concentration (mol/L) • R=pressure constant (.0831 liter bars/mol K) • T=temperature (C+273)

  5. Ѱp • Plant cells have cell walls • Turgor pressure pushes out on the cell wall • Limits expansion

  6. Equilibrium • Water moves until the water potential outside the cell is equal to the water potential inside the cell

  7. Practice problems • Calculate the water potential of a 1M sucrose solution at 22° C • Calculate the water potential of a cell that has a pressure potential of 4 and a solute potential of -5 • What would happen to the cell if it were placed in the 1M sucrose solution?

  8. The initial molar concentration of the cytoplasm inside a plant cell is 2M and the cell is placed in a solution with a concentration of 2.5M. • Calculate the water potential of the cell and of the solution • Predict which direction water will move based on your calculations • Predict what will happen to the pressure potential of the cell • What will be the water potential of the cell once the system has reached equilibrium

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