Water_Potential_Practice_Probems - Calculation of Water...

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Calculation of Water Potential from Experimental Data Name: Lindsey Loeb Date: 10/27/2020 The solute potential of a sucrose solution can be calculated using the following formula: Ψ s = -iCRT i = Ionization constant (for sucrose this is 1.0 because sucrose is a sugar and does not ionize in water.) C = Molar concentration R = Pressure constant (R = 0.0831 liter bars/mole °K) T = Temperature °K (273 + °C of solution) The units of measure will cancel as shown in the following example: If you have a 1.0 M sugar solution at 22 °C under standard atmospheric conditions Ψ s = -i x C x R x T Ψ s = -(1) (1.0 mole/liter) (R = 0.0831 liter bars/mole °K) (295 °K) Ψ s = - 24.51 bars Knowing the solute potential of the solution (Ψ s ) and knowing that the pressure potential of the solution is zero (Ψ p = 0) allows you to calculate the water potential of the solution. The water potential will be equal to the solute potential of the solution. Ψ = 0 + Ψ s or Ψ = Ψ s 1. The water potential of the solution at equilibrium will be equal to the water potential of

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