The Molarity Calculator finds the concentration, mass of solute or volume of solution, and solves dilution problems (C1V1 = C2V2).
Concentration = 0.855578 M
| Concentration | 0.855578 mol/L |
| Moles of solute | 1.711157 mol |
| V1 | 100 |
Calculation steps:
| C1 × V1 = C2 × V2 | V1 = 100 |
Molarity (M) is the number of moles of solute per litre of solution. A 1 M solution of sodium chloride contains 58.44 g of NaCl in each litre.
Molarity = moles ÷ volume (L) = mass (g) ÷ (molecular weight × volume).
Worked example (defaults): 100 g of NaCl (58.44 g/mol) in 2 L is 100 ÷ 58.44 ÷ 2 = 0.8556 M.
When diluting, the moles of solute stay the same: C1 × V1 = C2 × V2. To make 500 mL of 1 M from a 5 M stock, take 100 mL of stock and add water to 500 mL.
Molality is moles per kilogram of solvent and does not change with temperature; molarity uses solution volume, which does.
Where do I find molecular weight? Use the Molecular Weight Calculator.
Should I add solute to 1 L of water? No, dissolve and then fill up to the final volume.
What is normality? Equivalents per litre, used for acids and bases.