Enter the ionization constant, molar concentration, pressure constant, and temperature into the calculator to determine the solute potential. This calculator helps in understanding the potential of a solute to move in a particular direction in a solution.

Solute Potential Formula

The following formula is used to calculate the solute potential (Ψs):

Ψs = -i * M * R * T

Variables:

  • Ψs is the solute potential (bars)
  • i is the ionization constant (unitless)
  • M is the molar concentration (mol/L)
  • R is the pressure constant (L·bar/mol·K)
  • T is the temperature (K)

To calculate the solute potential, multiply the ionization constant, molar concentration, pressure constant, and temperature together, then apply a negative sign to the result.

What is Solute Potential?

Solute potential, also known as osmotic potential, is a component of water potential that is due to the presence of solute molecules. It is a measure of the tendency of water to move from an area of higher water potential to an area of lower water potential due to the presence of solutes. In biological systems, solute potential is important for understanding water movement in and out of cells and tissues.

How to Calculate Solute Potential?

The following steps outline how to calculate the Solute Potential.


  1. First, determine the ionization constant (i) of the solute.
  2. Next, determine the molar concentration (M) of the solution in mol/L.
  3. Next, use the pressure constant (R) which is typically 0.0831 L·bar/mol·K.
  4. Next, determine the temperature (T) of the solution in Kelvin.
  5. Next, gather the formula from above = Ψs = -i * M * R * T.
  6. Finally, calculate the Solute Potential (Ψs) in bars.
  7. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Ionization Constant (i) = 1

Molar Concentration (M) = 0.5 mol/L

Pressure Constant (R) = 0.0831 L·bar/mol·K

Temperature (T) = 298 K