Chemistry calculator
Molarity Calculator
Calculate solution molarity from moles or from mass and molar mass.
Molarity
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What is molarity?
Molarity is a measure of concentration. It tells you how many moles of solute are present in one liter of solution.
Molarity formula using moles
M is molarity in mol/L, n is the number of moles of solute, and V is the solution volume in liters.
Example using moles
Suppose a solution contains 0.5 moles of solute in 2 liters of solution.
The solution therefore has a molarity of 0.25 mol/L, or 0.25 M.
Frequently asked questions
What units are used for molarity?
Molarity is typically expressed as moles per liter, written mol/L or simply M.
Do I need to convert milliliters to liters?
Yes. The standard molarity formula uses liters. Calquo automatically converts milliliters to liters when you select mL.
How do I calculate moles from grams?
Divide the mass of the solute in grams by its molar mass in grams per mole.
What is molar mass?
Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol).
Is molarity based on solution volume or solvent volume?
Molarity uses the total final volume of the solution, not just the volume of the solvent before the solute is added.