How to use the osmotic pressure calculator
Compute osmotic pressure of a solution. Enter van 't hoff factor, molarity, temperature in the fields above; the osmotic pressure, osmotic pressure are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- i — van 't Hoff factor
- M — Molarity (mol/L)
- T — Temperature (K)
Worked example
With van 't hoff factor = 1, molarity = 0.1 mol/L, temperature = 298.15 K, the calculator gives osmotic pressure ≈ 2.446529 atm; osmotic pressure ≈ 247.8946 kPa.
Frequently asked questions
What is the formula for the osmotic pressure calculation?
Osmotic pressure (atm) = i × M × 0.082057 × T. Osmotic pressure (kPa) = [Osmotic pressure] × 101.325. Here i is van 't hoff factor, M is molarity (mol/L), T is temperature (K).
What inputs do I need for the osmotic pressure calculator?
You need van 't hoff factor, molarity in mol/L, temperature in K. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.