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Practice of Kinetics (Comprehensive Chemical Kinetics, Volume 1)

Practice of Kinetics (Comprehensive Chemical Kinetics, Volume 1)

Practice of Kinetics (Comprehensive Chemical Kinetics, Volume 1)

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2 CONSISTENCY WITH EQNS. OF TYPE -d[A]/dt = k[A]”[BIb 385The procedure is exactly analogous to that outlined previously except that weweight each rate coefficient thusF is calculated from the expressionI=rIf the data pass the F-test, there can be little doubt <strong>of</strong> the correctness <strong>of</strong> theassumed rate expression. The best value <strong>of</strong> the rate coefficient calculated in thisway is E, viz.c W(kJ1= 1This estimate is negligibly different from that calculated using eqn. (72) where theweighting factors were l/s2(ki), provided that the number <strong>of</strong> points defining eachstraight line is fairly large. The standard error <strong>of</strong> E follows as before from the larger<strong>of</strong> the two mean squaresi=rms, = C ~ (k~)(k,-E)~/(r-~)1=1i=r 1=rThe second <strong>of</strong> these two equations is analogous to eqn. (63). Confidence limits forli can be calculated from s(E) and the value <strong>of</strong> the statistic t corresponding to thechosen confidence level and the number <strong>of</strong> degrees <strong>of</strong> freedom used in estimatingmsi or ms,.References p. 407

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