Chapter 13, Problem 13.123QP

The reaction of thioacelamidc with water is shown by the equation below:

${\text{CH}}_{\text{3}}\text{C}(\text{S}){\text{NH}}_2(aq)+{\text{H}}_2\text{O}\stackrel{}{\to }{\text{H}}_2\text{S}(aq)+{\text{CH}}_3\text{C}(\text{O}){\text{NH}}_2(aq)$

The rate of reaction is given by the rate law:

$\text{Rate}=k[{\text{H}}_3{\text{O}}^{+}][{\text{CH}}_3\text{C}(\text{S}){\text{NH}}_2]$

Consider one liter of solution that is 0.20 M in CH₃C(S) NH₂ and 0.15 M in HCl at 25°C.

1. a For each of the changes listed below, state whether the rate of reaction increases, decreases, or remains the same. Why?
   1. i. A 4-g sample of NaOH is added to the solution.
   2. ii. 500 mL of water is added to the solution
2. b For each of the changes listed below, state whether the value of k will increase, decrease, or remain the same. Why?

   i. A catalyst is added to the solution.

   ii. The reaction is carried out at 15^oC instead of 25°C.