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CHM 112
Section 1

Homework Assignment #6
Due Febuary 6, 2006 by 8:05 a.m.

Practice (not to be turned in): Review Questions 13.14, 13.16, Problems 13.61, 13.65, 13.67, 13.85

The following mechanism is proposed for a reaction run in aqueous solution. Hydronium ion (H3O+) is a catalyst for the reaction.

[Cr(H2O)6]2+(aq) + [Co(NH3)5Cl]2+(aq) [(H2O)5Cr–Cl–Co(NH3)5]4+(aq) + H2O(l)

[(H2O)5Cr–Cl–Co(NH3)5]4+(aq) + H2O(l) [Cr(H2O)5Cl]2+(aq) + [Co(NH3)5(H2O)]2+(aq)

[Co(NH3)5(H2O)]2+(aq) + H3O+(aq) [Co(NH3)4(H2O)2]2+(aq) + NH4+(aq)

[Co(NH3)4(H2O)2]2+(aq) + H3O+(aq) [Co(NH3)3(H2O)3]2+(aq) + NH4+(aq)

[Co(NH3)3(H2O)3]2+(aq) + H3O+(aq) [Co(NH3)2(H2O)4]2+(aq) + NH4+(aq)

[Co(NH3)2(H2O)4]2+(aq) + H3O+(aq) [Co(NH3)(H2O)5]2+(aq) + NH4+(aq)

[Co(NH3)(H2O)5]2+(aq) + H3O+(aq) [Co(H2O)6]2+(aq) + NH4+(aq)

[Cr(H2O)5Cl]2+(aq) + H2O(l) [Cr(H2O)6]3+(aq) + Cl(aq)

a) Write the net reaction associated with the mechanism.

b) Identify the most probable slow step. Explain why you chose this step.

c) Write the rate law for the net reaction. Indicate the order of reaction for each reactant.


Turn in the following on a clean, full sheet of paper (not torn out of a notebook):

Name
Student ID Number
The answers to the questions.