⚗️Osmotic Pressure Calculator (π=MRT)
Osmotic pressure is the pressure needed to prevent osmosis — the flow of solvent across a semipermeable membrane from dilute to concentrated solution. π = MRT, where M is molarity, R is the gas constant, and T is temperature in Kelvin.
- 1π = M × R × T
- 2R = 0.08206 L·atm/mol·K
- 3M = molar concentration of solute
- 4T = temperature in Kelvin
- 5For electrolytes: multiply by van't Hoff factor i
0.1M NaCl solution at 25°C (298K) · i=2=π = 0.2×0.08206×298 = 4.89 atmNaCl dissociates completely → i=2
⭐
Fun Fact
Reverse osmosis desalination uses pressure exceeding seawater's osmotic pressure (~26 atm / 380 psi) to push water through a membrane, removing salt — now providing drinking water for millions worldwide.
References
🔒
100% Free
No sign-up ever
✓
Accurate
Verified formulas
⚡
Instant
Results as you type
📱
Mobile Ready
All devices