Horvath Practice Problems 17

Horvath Practice Problems 17 - aA bB → cC(3.1 and the...

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initially v 0 = ka x b y where a and b are the initial concentrations of A and B respectively taking the log of both sides gives ln v 0 = ln[ ka x b y ] = ln k + x ln a + y ln b a and b can be varied independently so both x and y can be determined. usually the experiment is run so the order can be easily determined by simple inspection. problems (a) if the concentration drops very sharply (b) if there is an induction period 2. Method of isolation for v = k [ A ] x [ B ] y rate laws fl ood with, say, A so v ka x [ B ] y repeat for the other reactants Example: Method of Initial Rates Consider the reaction
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Unformatted text preview: aA + bB → cC (3.1) and the following experimental data Run [ A ] [ B ] [ A ] 95% I 0.1 M 0.1 M 20 min II 0.1 M 0.2 M 10 min II 0.2 M 0.1 M 10 min The data from run I gives an initial rate of v I = . 05 × . 1 M 20 min = 0 . 00025 M/min (3.2) Likewise from runs II and III v II = . 05 × . 1 M 10 min = 0 . 00050 M/min (3.3) and v III = . 05 × . 2 M 10 min = 0 . 00100 M/min (3.4) Now, by comparison we can obtain the order. 16 DETERMINATION OF RATE LAWS...
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