Calculation of Water Potential from Experimental Data Name _____________________ Date ____________ Per _____1. The solute potential of this sucrose solution can be calculated using the following formula: ψs= -iCRT where i = Ionization constant(for sucrose this is 1.0 because sucrose does not ionize in water) C = Molar concentration(determined from your graph –see your potato data) 2.
Knowing the solute potential of the solution (ψs) and knowing the pressure potential of the solution is zero (ψp= 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 + ψs or ψ= The water potential of the solution at equilibrium will be equal to the water potential of the potato cells. What is the water potential of the potato cells? ψs