ClkTmp - Chem 6 LECTURE DEMONSTRATION#2(TEMPERATURE...

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Temperature dependence of the clock reaction 1 Chem 6 LECTURE DEMONSTRATION #2 (TEMPERATURE DEPENDENCE OF k ) The Arrhenius expression for the rate constant k = A e E a / RT is an empirical equation that allows us to systematize kinetic data. Here, R is the Universal gas constant, 8.31451 J mol –1 K –1 , T is the absolute temperature, E a is the activation energy (units: J mol –1 ), and A is the pre-exponential frequency factor . By running the reaction at several temperatures and fitting the measured rate constants k to the above equation, we can predict k at any temperature. This demonstration should also indicate to you the importance of regulating the temperature carefully during the course of the reaction. We will use the same reaction as in Demonstration #1: S 2 O 8 2– + 2 S 2 O 3 2– 2 SO 4 2– + S 4 O 6 2– peroxydisulfate thiosulfate sulfate dithionate We will measure reaction times τ for reaction mixture B (defined in the Demo #1
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ClkTmp - Chem 6 LECTURE DEMONSTRATION#2(TEMPERATURE...

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