GlenCalc

Molarity calculator

Molarity (M) is moles of solute per liter of solution. Enter the molar mass (or a formula) and two of mass, volume and concentration.

Used when no formula is given.

Your answer

Mass to dissolve2.922 g
Moles0.05
Molar mass used58.44 g/mol

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How we worked it out

Updated as you change the numbers.

  1. Moles = mass ÷ molar mass. Molarity = moles ÷ liters of solution. Mass = molarity × liters × molar mass.

Method and assumptions

Molarity uses the final volume of the solution, not the volume of water added: dissolve the solute in less water, then top up to the mark in a volumetric flask.

Questions

How much NaCl makes 500 mL of a 0.1 M solution?

2.922 g (0.05 mol × 58.44 g/mol).

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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