INDUSTRY|chemistry
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- ga
- pseudo-first order rate coefficient | pseudo first-order rate constant | hydrolysis constants
- en
- Definition "if in a reaction between A and B, B stays constant, then the order of the reaction [ IATE:3523310 ] (with respect to time), as observed from the concentration change of A with time, will be α, and the rate of disappearance of A can be expressed in the form: vA = kobs[A]α (since the overall rate of reaction is given by: v = k[A]α[B]β). The proportionality factor kobs deduced from such an experiment is called the 'observed rate coefficient' and it is related to the ( α + β )th order rate coefficient k by the equation: kobs = k[B]β. For the common case when α = 1, kobs is often referred to as a 'pseudo-first order rate coefficient' (kψ)" Reference "IUPAC. Compendium of Chemical Terminology, 2nd ed. (the ""Gold Book""). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins http://goldbook.iupac.org/O04322.html [1.7.2010]"