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Glossary Science & Engineering

Molarity

Molarity is the concentration of a solution: moles of solute per litre of solution, written M.

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In more detail

10 g of sodium chloride (58.44 g/mol) is 0.1711 mol; dissolved to 0.5 L it gives 0.342 M. To dilute, use C₁V₁ = C₂V₂: 50 mL of 2 M made up to 200 mL is 0.5 M.

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Molarity Calculator

Calculate the molarity of a solution from solute mass, molar mass, and solution volume — a core calculation for chemistry lab work.

Dilution Calculator

Find the stock volume, final volume or concentrations in M, mM, mg/mL or %, see how much diluent to add, and plan serial dilutions.

See also

  • Glossary Molecular weight
    Molecular weight, or molar mass, is the mass of one mole of a substance, found by adding the atomic weights of every atom in its formula.
  • Cheat sheet Physics & Chemistry Formulas Cheat Sheet
    Density, weight, moles, molarity, dilution, the ideal gas law, projectile range and half-life.
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