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Chemistry vocabulary · Solutions and Concentration

Molarity

Meaning in chemistry, with examples

/məʊˈlærəti/nounCore term

In chemistry, molarity means: A measure of concentration: the number of moles of solute in one liter of solution. Its unit is mol/L, written M and read 'molar'.

In Turkish: molarite, molar derişim

How it is used

The standard way to state concentration in the lab; '0.5 M' is read 'zero point five molar'. It is per liter of solution, not per liter of solvent. Molality (moles per kilogram of solvent) is a different quantity.

Example sentences

  1. What is the molarity of a solution with 4.0 g of NaOH in 500 mL?

  2. Check the molarity on the label before you use the stock solution.

Common collocations

  • calculate the molarity
  • molarity of
  • final molarity
  • 0.1 M solution
  • concentrationThe amount of a substance in a given volume of solution or mixture, for example in moles per liter (mol/L), grams per liter or parts per million (ppm).
  • moleThe SI unit for amount of substance. One of these units contains about 6.022 × 10²³ particles, which lets chemists count atoms and molecules by weighing them.
  • solutionA uniform mixture in which one substance (the solute) is completely dissolved in another (the solvent). Salt water and sugar dissolved in tea are everyday examples.
  • diluteTo make a solution weaker by adding more solvent, usually water. As an adjective, the word describes a solution with a low concentration.
  • molar massThe mass of one mole of a substance, usually given in grams per mole (g/mol). For water it is about 18.02 g/mol.

More terms: Solutions and Concentration

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