Lab tool
Molarity Calculator
Plan a solution before you weigh anything. Enter the molar mass, the concentration you need, the final volume and the assay printed on the certificate of analysis.
Results update as you type. Nothing is sent or stored.
Weigh out—
How the result is worked out
Mass (g) = concentration (mol/L) × volume (L) × molar mass (g/mol) ÷ (assay / 100). Small results are shown in milligrams.
Good to know
- Take the assay from the COA of the lot you are using, not from the catalogue grade.
- For hydrated salts use the molar mass of the hydrate you actually weigh.
- Make up to volume in a volumetric flask after dissolving.
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