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Molarity calculator

Compute molarity (M), moles, or solution volume using M = moles / liters for lab prep.

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Molarity M (mol/L) is moles of solute n divided by the total solution volume V in liters: M = n / V. This ignores non-ideal behavior and assumes V is the final mixed volume after preparation.

Volume

0.5 L (500 mL)

From M = 0.25 mol/L · n = 0.125 mol

For dilution ladders (MiVi = MfVf) consider a dedicated dilution worksheet or stock math—only the definition M = n/V is modeled here.

What “molarity” assumes

Classroom molarity treats the solute's dissolved amount and the volumetric flask reading as sufficient: add solute, dissolve, dilute to the mark, read V as total solution volume. Ionic strength, ion pairing, temperature, and volumetric contraction are folded into finer models—use this page for homework checks and stoichiometric scaling.

Related tooling

For very large or small magnitudes expressed as powers of ten, use the Scientific Notation Calculator; for guarding digit rules on lab reports pair with Significant Figures Calculator.

Guides & resources

  • What Is Molarity? Formula, Units & How to Calculate It

    Molarity is a measure of the concentration of a solution, defined as the number of moles of solute per liter of solution. It is commonly used in chemistry to determine the concentration of a solution in a laboratory setting. The molarity calculator helps you calculate the molarity of a solution based on the number of moles of solute and the volume of the solution.

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Compute molarity (M), moles, or solution volume using M = moles / liters for lab prep. Open the tool in your browser on Toolsle.com — free, fast, and no download required.

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