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Molar conductivity is defined as the conductivity of an electrolyte solution divided by the molar concentration of the electrolyte, and so measures the efficiency with which a given electrolyte conducts electricity in solution. Its units are siemens per meter per molarity, or siemens meter-squared per mole. The usual symbol is a capital lambda, Λ, or Λm.
Additional recommended knowledge
Friedrich Kohlrausch established that to a high accuracy in dilute solutions, molar conductivity is composed of individual contributions of ions. This is known as the law of independent migration of ions.
From its definition, the molar conductivity is given by:
In contrast, Kohlrausch showed that the molar conductivity is strongly concentration dependent for weak (incompletely dissociated) electrolytes; the more dilute a solution, the greater its molar conductivity, due to increased ionic dissociation. (This, for example, is the case of proteins in polyacrylamide gel electrophoresis.)
The limiting molar conductivity can be decomposed into contributions from the different ions (law of independent migration of ions):
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Molar_conductivity". A list of authors is available in Wikipedia.|