Molarity (M)

Molarity of a solution is the number of moles of the solute per litre of solution (or number of millimoles per ml. of solution). Unit of molarity is mol/litre or mol/dm3 For example, a molar solution of sugar means a solution containing 1 mole of sugar (i.e., 342 g or molecules of it) per litre of the solution. Solutions in term of molarity generally expressed as,

= Molar solution, = Molarity is two,

or 0.5 M = Semimolar solution,

or 0.1 M = Decimolar solution,

or 0.01 M = Centimolar solution

or 0.001 M = Millimolar solution

Molarity is most common way of representing the concentration of solution.

· Molarity is depend on temperature as,

· When a solution is diluted (x times), its molarity also decreases (by times)

Mathematically molarity can be calculated by following formulas,

(i) ,







(viii) If molarity and volume of solution are changed from to . Then,

(Molarity equation)

(ix) In balanced chemical equation, if moles of reactant one react with moles of reactant two. Then,

(x) If two solutions of the same solute are mixed then molarity (M) of resulting solution.

(xi) Volume of water added to get a solution of molarity from of molarity is


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