Molarity Calculator
The Molarity or molar concentration of a solution is the ratio of moles of solute per liter of solution (mol/L, or M). To first find the number of moles of a solute with a known mass, divide the mass of the solute (in g) by its molecular weight.
Using 2.0 grams of sodium chloride (NaCl) in .05 L of water as an example:
Molecular weight of NaCl = 58.44 g/mol
Molecular weight of NaCl = 58.44 g/mol
2.0 g58.44 g/mol = 0.0342 moles of NaCl
2.0 g58.44 g/mol = 0.0342 moles of NaCl
Using that result, the molarity can now be calculated:
0.0342 mol.05 L = 0.0684463 M
Thus, equation to calculate molarity can be expressed by:
solute masssolution volume = molarity molar mass
Use the calculator below to find the molarity of a solution using the molecular weight and mass of the solute, the volume of the solution, or its concentration
Molarity Calculator
| Mass of Solute | Molecular Weight |
| Volume of Solution | Molarity (M) |