Molar concentration

2014-10-12T20:06:57Z

130.88.177.91: the word "dissolution" was used, change the sentence so it uses simpler terminology

'''Molar concentration''', or '''molarity''', or simply [[concentration]], is a term in [[physical chemistry]]. It measures the concentration of a [[solution]] or [[mixture]].

In chemistry, the '''molar concentration''', <math>c_i</math> is defined as the [[amount of substance|amount]] of a constituent <math>n_i</math> (usually measured in [[Mole (unit)|moles]] – hence the name) divided by the [[volume]] of the mixture <math>V</math>:<ref name="GoldBook"> [[International Union of Pure and Applied Chemistry]]. Amount concentration, c. ''Compendium of chemical terminology'', internet edition. [http://goldbook.iupac.org/A00295.html]</ref>

:<math>c_i = \frac {n_i}{V}</math>

The volume <math>V</math> in the definition <math>c_i = n_i/V</math> refers to the volume of the [[solution]], ''not'' the volume of the [[solvent]]. One litre of a solution usually contains either slightly more or slightly less than 1 [[litre]] of solvent because when a substance dissolves in a solvent it causes volume of liquid to increase or decrease.

The [[reciprocal]] quantity represents the [[dilution]] (volume) which can appear in Ostwald's [[law of dilution]].

== References ==
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{{chem-stub}}

[[Category:Physical chemistry]]

TCS Wiki - User contributions [en]

Molar concentration