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Rewrite the integrated form equations for zero, first and second order in terms of absorption.

Differential form ReactionDi Order Integrated form Zero Order Rate v--dIA/dt kAA] [Al. -k,t First Order | Rate kr[A]- A] Alo

Where ε is the molar absorptivity of crystal violet at the wavelength of the maximum absorption peak, l is the length of the cuvette (l = 1cm) and [CV+ ] is the crystal violet concentration. The absorbance, Ab, may therefore be used as a measure of the crystal violet concentration in all calculations since: At time = 0: Abo = ε l [CV+ ]o At time = t: Abt = ε l [CV+ ]t Thus: Abo/Abt = ε l [CV+ ]o/ ε l [CV+ ]t = [CV+ ]o/[CV+ ]t (13) 6 The integrated form equations for zero, first and second order can be rearranged and [CV+ ]o/[CV+ ]t substituted for Abo/Abt . This will give theoretical expressions that relate the absorbance values to time and to the rate constant kr

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