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Molarity (C = n/V)

Also known as moles per litre · concentration from moles

C=nVC = \frac{n}{V}
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Worked example: 2 mol in 4 L → 0.5 mol/L. Press Try an example to run it live, then adjust anything.

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Mixing Two Solutions (C₁V₁ + C₂V₂ = C_f V_f)Osmotic Pressure (Π = MRT)Beer–Lambert Law (A = εbc)Dilution Equation (C1V1 = C2V2)
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See also

Mixing Two Solutions (C₁V₁ + C₂V₂ = C_f V_f): What happens when two solutions of different molarity go into the same tank.Dilution Equation (C1V1 = C2V2): Both use molar concentration and volume of solution.
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Molarity (C = n/V) explained

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Molarity answers the practical question "how much stuff is in this bottle?" by counting moles of solute per liter of solution. Dissolve 58.44 g of table salt, exactly one mole of NaCl, in water and top up to the 1.00 L mark of a volumetric flask, and you have a 1.00 M solution. Note the fine print: it is per liter of solution, not per liter of water added, which is why chemists fill to a calibrated mark instead of adding a measured liter of solvent.

Molarity is the workhorse concentration unit because reactions are mole-to-mole affairs: multiplying C by a dispensed volume immediately gives the moles delivered, which is exactly what a titration calculation needs. Physiological saline is about 0.154 M NaCl, ocean water roughly 0.5 M, and concentrated hydrochloric acid around 12 M: a span that dilution calculations cross daily in every lab.

Molarity (C = n/V) formula

C=nVC = \frac{n}{V}
Where
  • CC= Molar concentration (M)
  • nn= Amount of solute (mol)
  • VV= Volume of solution (L)
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Ways to express concentration

6 formulasMolarity, molality, mass percent, mole fraction, normality and the dilution equation — six answers to “how much solute is in there?”

Revised 16 October 2026
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formula.expert. (2026, October 16). Molarity (C = n/V) Formula & Calculator. https://formula.expert/solvers/molarity

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