Osmotic Pressure Calculator

0.0(0)

Calculates the osmotic pressure of a solution using the van't Hoff equation. Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.

More tools:Science & Lab Calculators

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Molarity (mol/L), Temperature (K), van't Hoff Factor (i), and Ideal Gas Constant (L·atm/mol·K) in the units shown.

Step 2

Read Osmotic Pressure in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Glucose at 25°C

Molarity (mol/L): 0.1 mol/L; Temperature (K): 298.15 K; van't Hoff Factor (i): 1; Ideal Gas Constant (L·atm/mol·K): 0.0821 L·atm/mol·K

Osmotic Pressure: 2.4478115 atm

NaCl at 25°C

Molarity (mol/L): 0.1 mol/L; Temperature (K): 298.15 K; van't Hoff Factor (i): 2; Ideal Gas Constant (L·atm/mol·K): 0.0821 L·atm/mol·K

Osmotic Pressure: 4.895623 atm

MgCl2 at 25°C

Molarity (mol/L): 0.1 mol/L; Temperature (K): 298.15 K; van't Hoff Factor (i): 3; Ideal Gas Constant (L·atm/mol·K): 0.0821 L·atm/mol·K

Osmotic Pressure: 7.3434345 atm

Explore the topic

Explore More Science & Lab Calculators

Find calculators for chemistry, biology, lab dilution, concentration, osmolarity, genetics, physics, and experimental planning.

Explore tools

People Also Calculate

Related Calculators

Continue with another tool on a related topic.

Chemistry

STP Calculator

Calculates the volume or number of moles of a gas at Standard Temperature and Pressure (STP). STP is defined as 0°C (273.15 K) and 1 atm pressure. This calculator uses the ideal gas law to perform these calculations.

1,469 viewsOpen calculator

Chemistry

Melting Point Calculator

Calculates the melting point of a substance based on the provided pressure. This calculator uses a simplified model and is most accurate for substances with well-defined melting points. Note: This calculator provides estimations and should not be used for critical applications.

1,451 viewsOpen calculator

Chemistry

Van't Hoff Factor Calculator

Calculates the Van't Hoff factor (i), which represents the number of particles a solute dissociates into in a solution. This factor is important in colligative properties calculations.

1,374 viewsOpen calculator

Chemistry

Parts Per Million (PPM) Converter

Convert between PPM and other concentration units like percentage, ppb, ppt, mg/kg, and mg/L (for solutions with a density close to 1 g/mL).

1,346 viewsOpen calculator