Molarity Calculator (Moles ÷ Volume)
Find the molar concentration of a solution (mol per litre).
Result
Molarity (M)
1 mol/L
Moles of solute
1 mol
Mass of solute
58.44 g
Concept
Molarity (M) is the most common concentration unit in chemistry — moles of solute per litre of solution. A 1 M NaCl solution contains 58.44 g of NaCl dissolved in enough water to make exactly 1 litre of solution (not dissolved in 1 L of water).
Note: moles of solute ÷ litres of solution, not litres of solvent. The volume refers to the total final volume of the solution.
Related concentration units: molality (mol/kg solvent), normality (equivalents/L), and mass percent. Molarity changes with temperature because solution volume expands; molality doesn't.
Formula
Molarity (M)=Moles of soluteVolume of solution (L)
Moles=Mass (g)Molar Mass (g/mol)
Variables
Mmol/L- Molarity.
nmol- Moles of solute = mass ÷ molar mass.
VL- Total volume of the solution in litres.
massg- Mass of solute weighed out.
Molar Massg/mol- Molar mass of the solute.