Medical Term:

van't Hoff law

Pronunciation: vahnt hof

Definition:

  1. in stereochemistry, all optically active substances have one or more multivalent atoms united to four different atoms or radicals so as to form in space an asymmetric arrangement;
  2. the osmotic pressure exerted by any substance in dilute solution is the same that it would exert if present as gas in the same volume as that of the solution; or, at constant temperature, the osmotic pressure of dilute solutions is proportional to the concentration (number of molecules) of the dissolved substance; the osmotic pressure, Π, in dilute solutions is Π = RTΣci, where R is the universal gas constant, T is the absolute temperature, and ci is the molar concentration of solute i;
  3. the rate of chemical reactions increases between two- and threefold for each 10°C rise in temperature.

[Jacobus H. van't Hoff]

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