Concentrations of stock solutions: Name: __________________________________ Section: ___ CHE 112 - Kinetics A.) Determining the Rate Law Varying KIO3 [ ]0 [H3O+]0 [I-]0 [H3AsO3]0 Time (s) Average Time...

Concentrations of stock solutions:
Name: __________________________________ Section: ___
CHE 112 - Kinetics
A.) Determining the Rate Law

Varying KIO3
[ ]0 [H3O+]0 [I-]0 [H3AsO3]0 Time (s)
Average
Time (s)
rate (M s-1)

XXXXXXXXXX

XXXXXXXXXX
Varying KI
[ ]0 [H3O+]0 [I-]0 [H3AsO3]0 Time (s)
Average
Time (s)
rate (M s-1)

XXXXXXXXXX

XXXXXXXXXX
Varying pH
[ ]0 [H3O+]0 [I-]0 [H3AsO3]0 Time (s)
Average
Time (s)
rate (M s-1)

XXXXXXXXXX

XXXXXXXXXX
*All concentrations in M
Show sample calculations in the space below
Write the rate law:
Name: __________________________________ Section: ___
CHE 112 - Kinetics
B.) Temperature Effects

Initial concentrations used for each trial
[ ]0 _____________ [H3O
+]0 _____________ [I
-]0 _____________
[H3AsO3]0 ___0.0015 M_____
Temp (oC) Temp (K) 1/T (K-1) Time (s) Rate (M s-1) K (units ?) ln(k)
* Show sample calculations in the space below
Name: __________________________________ Section: ___
CHE 112 - Kinetics
Create a graph of ln(k) vs 1/T in Excel and paste it in the space below
Calculate the Activation Energy
Name: __________________________________ Section: ___
CHE 112 - Kinetics
Questions
1.) Determine the mass of potassium iodate needed to prepare a 0.010 M solution with a volume
of 50.00 mL.
2.) What is required for an effective collision to occur?

3.) Explain the relationship between concentration and reaction rate.

4.) When doe the color change occur in this experiment?
a.) When all of the KIO3 reacts
b.) When all of the KI reacts
c.) When all of the H3AsO3 reacts
d.) When all of the reactants have reacted

5.) What is the difference between an average rate and an instantaneous rate? What did you
calculate in this lab?
Name: __________________________________ Section: ___
CHE 112 - Kinetics
6.) What is the overall reaction order for the experiment?

7.) What are the units of the rate constant?

8.) Explain why reaction rate increases as temperature increases.
May 04, 2021

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