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Osmolarity Calculator

Chemistry
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Calculates the osmolarity of a solution based on the molar concentration of solutes.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Molarity (mol/L), Dissociation Factor (i), and Number of Solutes in the units shown.

Step 2

Read Osmolarity 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.

NaCl in Water

Molarity (mol/L): 0.15 mol/L; Dissociation Factor (i): 2; Number of Solutes: 1

Osmolarity: 0.3 Osm/L

Glucose in Water

Molarity (mol/L): 0.2 mol/L; Dissociation Factor (i): 1; Number of Solutes: 1

Osmolarity: 0.2 Osm/L

MgCl2 in Water

Molarity (mol/L): 0.1 mol/L; Dissociation Factor (i): 3; Number of Solutes: 1

Osmolarity: 0.3 Osm/L

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