Question

What advantages do the Guggenheim and Kezdy-Swinbourne methods of determining first-order rate constant have over other methods?

(experiment: Decolorisation of crystal violet- To study the effect of hydroxyl ions on the kinetics of the decolourisation of crystal violet using the isolation method.)

Answer 1

* The Guggenheim and kezdy swinho wine methods of determining firest order rate constant over another methods are 1. other methods for determining first order rate constant depend heavily on accurate value Poo. in general where Poo & do, an accurate value of poo is difficult to obtain, and even in the irreversible reactions when poo = do, the instantaneous concentration of A at zero time may be difficult to measure accurately. The major advantage of Guggenheim method is, it does not require an estimate of poo, as Kil/k-, is equal to the equilibrium constant, which is eastimated independently. The comparative equations are given below

03 ourne method p = ao [l-exp(- kt) ] other methods (Kezdy Swinb- log (poo-b) = log poo - [[KHtK-1) +/2:30}] Incbi-bi) +(k+tK-11 fi = Constant (Guggenheim) the value of Kri and Ky is calculated from the two Combinations. la-g boy time Guggeh heim method Razdy - Swin bourne method. Both these plots are insensitive to deviation from first order Kinetics, ie they can give apparently good straight Lines in case when first order Kinetics are not accurately obeyed.