Iodine Clock Pre Lab

Name:__________________

1. List health and safety hazards associated with H₂O₂ and H₂SO₄ . If this compound cannot be found in the MSDS at the back of the lab manual, look it up on the web.

2. Calculate the concentrations for H₂O₂ and KI in part I of the experiment. Fill in the chart. Don't forget the dilution!

Run	[H2O2]	[KI]
1
2
3

3. What is the purpose of the Na₂S₂O₃ in the experiment? Using the volume and Molarity information in the procedure, calculate the moles of Na₂S₂O₃ in each flask.

4. Data for the following reaction:

[Mn(CO)₅(CH₃CN)]⁺ + NC₅H₅ ® [Mn(CO)₅(NC₅H₅)]⁺ + CH₃CN

appear in the table. From a plot of ln k vs 1/T, calculate E_a.

k (min ^-1)	T (K)
0.0409	298
0.0818	308
0.157	318

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