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submitted by spideyunlimited (3876 m) on 3 Nov 2007 23:05:32 IST (5 comments 266 views)
First Order ReactionA general unimolecular reaction where A is a reactant and P is a product is called a first-order reaction. The rate is proportional to the concentration of a single reactant raised to the first power. The decrease in the concentration of A over time can be written as: Equation (2) represents the differential form of the rate law. Integration of this equation and determination of the integration constant C produces the corresponding integrated law. Integrating equation (2) yields: The constant of integration C can be evaluated by using boundary conditions. When t = 0, [A] = [A]0. [A]0 is the original concentration of A. Substituting into eq
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submitted by chirag (384 m) on 27 Apr 2007 18:23:14 IST (3 comments 219 views)
Zero Order ReactionA reaction is of zero order when the rate of reaction is independent of the concentration of materials. The rate of reaction is a constant. When the limiting reactant is completely consumed, the reaction stops abruptly. The zero order rate law for the general reaction is written as the equation which on integration of both sides gives When t = 0 the concentration of A is [A]0. The constant of integration must be [A]0. Now the integrated form of zero-order kinetics can be written as follows Plotting [A] versus t will give a straight line with slope -k.
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submitted by chirag (384 m) on 27 Apr 2007 18:21:57 IST (1 comments 211 views)
