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Chpt%2016-2

# Chpt%2016-2 - Integrated Rate Laws 16.4 16.5 Last time...

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Integrated Rate Laws 16.4, 16.5

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Last time Factors that affect rate General form for rate laws Reaction order Determine rate law from experimental evidence
Rate Law Consider a reaction of A B Three common rate laws possible: Rate = k (zero order) Rate = k[A] (first order) Rate = k[A] 2 (second order) You can determine this by k… how?

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Rate Laws Simple rate laws can be manipulated so that one can solve for the concentration [A] t at any time, t, so long as you know k and initial concentration, [A] 0 Rate Law Integrated Rate Law Zero order Rate = k [A] t = -kt + [A] 0 First order Rate =k[A] ln[A] t = -kt + ln[A] 0 Second order Rate = k[A] 2 1/[A] t = kt + 1/[A] 0
Integrated Rate Laws You need to know which equation goes with which order Look for patterns: 1/A is second, ln[A] is first… Note, you need to know the reaction order before using an integrated rate law Also note, concentration of [A] t always decreases at time gets larger

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Examples What is the concentration at time = 25 s when [A] 0 = 0.75 M and k = 0.15 s -1 ?
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