Osmotic Pressure Calculator (π) - Colligative Property
Calculate osmotic pressure using the van 't Hoff equation for solutions at various temperatures. Chemistry calculator for physical chemistry, biology, pharmaceutical, and medical applications. Supports electrolytes and non-electrolytes with van 't Hoff factor.
Osmotic Pressure Formula
π = M · R · T · iVariables:
- πOsmotic pressure (atm)Osmotic pressure (atm)
- MSolution molarity (mol/L)Solution molarity (mol/L)
- RIdeal gas constant (0.082 L·atm/mol·K)Ideal gas constant (0.082 L·atm/mol·K)
- TAbsolute temperature (Kelvin)Absolute temperature (Kelvin)
- iVan't Hoff factor (1 for non-electrolytes)Van't Hoff factor (1 for non-electrolytes)
How to Use the KalkuLab Osmotic Pressure Calculator
- 1
Enter Concentration
Enter the molarity (M) of the solution.
- 2
Enter Temperature
Enter the temperature in Celsius or Kelvin (the calculator will convert if needed).
- 3
Set the van't Hoff Factor
For non-electrolytes (sugar, urea), i = 1. For electrolytes, calculate i = 1 + (n-1)α.
Examples
Glucose Osmotic Pressure
Problem:
Calculate the osmotic pressure of a 0.1 M glucose solution at 27°C.
Solution:
- 1.Given: M = 0.1, T = 27°C = 300 K, i = 1 (non-electrolyte), R = 0.082
- 2.Formula: π = M · R · T · i
- 3.Calculate: π = 0.1 × 0.082 × 300 × 1
- 4.Result: π = 2.46 atm
Result:2.46 atm
The osmotic pressure of this solution is 2.46 atm.
Frequently Asked Questions
What is osmotic pressure?
Osmotic pressure is the minimum pressure that must be applied to a solution to prevent the inward flow of pure solvent through a semipermeable membrane.
What is the van't Hoff factor?
A factor that accounts for the number of particles formed when an electrolyte dissolves. The more ions produced, the greater the colligative effect.