Consider the acid catalyzed reaction; АН + H+ > AH2* rate = k1[AH][H*] (fast) ---- AH2+ ----> AH + H+ rate = k2[AH2+] (fast) %3D AH2+ + B ----> BH+ + AH k3[AH2+][B] (slow) Using the pre-equilibrium approximation derive the rate law. rate = (kık3/k2)[H+][B] rate = (kık2/k3)[HA][H+][B] rate = (kık3/k2)[HA][H+][B] rate = (kık3/k2)[HA][B]

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Chapter1: Chemical Foundations
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Consider the acid catalyzed reaction;
AH + H+ ----> AH,+
rate = k1[AH][H*] (fast)
AH2+
----> AH + H+
rate =
k2[АН2*] (fast)
AH,+ + B ----> BH+ + AH
rate = k3[AH2*[B] (slow)
Using the pre-equilibrium approximation derive the rate law.
rate =
(kık3/k2)[H*][B]
rate =
(kık2/k3)[HA][H*[B]
rate =
(kık3/k2)[HA][H+][B]
rate =
(kık3/k2)[HA][B]
If the only source of H+ is from HA show that it is possible to derive a rate law that is independent of H+. What is the
rate law?
Hint: Add the fast equilibrium HA <------> H+ + A¯ to the proposed mechanism in part a).
(kık3Ka/2/k2)[HA]!/2[B]
(kık3Ka1/2/k2)[HA]3/2[B]
rate = (kık3/k2K1/2)[HA][B]
rate = (kık3/k2Ka1/2)[HA]3/2[B]
rate =
rate =
Transcribed Image Text:Consider the acid catalyzed reaction; AH + H+ ----> AH,+ rate = k1[AH][H*] (fast) AH2+ ----> AH + H+ rate = k2[АН2*] (fast) AH,+ + B ----> BH+ + AH rate = k3[AH2*[B] (slow) Using the pre-equilibrium approximation derive the rate law. rate = (kık3/k2)[H*][B] rate = (kık2/k3)[HA][H*[B] rate = (kık3/k2)[HA][H+][B] rate = (kık3/k2)[HA][B] If the only source of H+ is from HA show that it is possible to derive a rate law that is independent of H+. What is the rate law? Hint: Add the fast equilibrium HA <------> H+ + A¯ to the proposed mechanism in part a). (kık3Ka/2/k2)[HA]!/2[B] (kık3Ka1/2/k2)[HA]3/2[B] rate = (kık3/k2K1/2)[HA][B] rate = (kık3/k2Ka1/2)[HA]3/2[B] rate = rate =
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