Van't Hoff law
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, ?, in dilute solutions is ? = RTSci, 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.