The following discussion and videos can be used to complete Virtual Experiment 28 laboratory assignments
Complete the pre laboratory problems in the laboratory assignment before coming to the class meeting.
Method 1: Iodine Clock Reaction:
Part I: Complete the laboratory report, use the data on the class data sheet to complete the graphs and results.
Explain which of the three proposed mechanisms in the discussion fit the determined rate law for the iodine clock reaction.
Part II: Determine the Activation energy for the reaction.
Method 2: spectrometry method
Part I: Using the MicroLab spectrophotometer, collect Absorbance versus time data to determine the rate of the reaction. The class data contains the calculated slope of each trial. Complete the graphs and results using the concentration and volume data and absorption data given to determine the rate law for the reaction. Compare this to method 1 results.
Complete the conclusion paragraph for this experiment.
Complete the pre laboratory writing assignment in your laboratory notebook. The prewriting must be completed before the laboratory session begins. The writing should include a purpose/hypothesis of the experiment, a discussion or theory, a detailed step by step summary of the procedure explaining what data will be collected and how you will collect it. Data Tables or space to collect the data should be included within the procedure discussion. Look up any SDS on chemicals that you are not familiar.
Attempt the pre laboratory problems either as the document provided in the experiment or as the laboratory quiz in canvas before coming to the class meeting.
We will use class data sheet to explore real data collected in previous semesters to see the effect of concentration, temperature and catalysts on the rate of the reaction.
Part I. Initial rates and a study of the effect of concentration on rate.
Calculate the concentration and average rate for all seven trials to determine the rate law of the reaction.
Using the provided data, determine the affect of a catalyst on the reaction
Part II. Activation Energy and Temperature effects on reaction rates.
Using the class data, determine the activation energy of this reaction.
Michael Seery - This experiment demonstrates the iodine clock reaction between iodide and persulfate ions, using thiosulfate as the 'clock'. After some introduction details, three experiments are performed: studying the effect of concentration to determine the orders of reactants (3:01), studying the effect of temperature to determine the activation energy (7:47) and studying the effect of solvent polarity (9:42).
Iodine Clock Part 2 Temperature! Ea calculation
Alexandria Chemistry - this reaction using peroxide instead of persulfate in the iodine clock reaction but the calculations are the same.
We will use class data sheet to explore real data collected in previous semesters to see the effect of concentration, temperature and catalysts on the rate of the reaction.
Part I. Initial rates and a study of the effect of concentration on rate.
Calculate the concentration and average rate for all seven trials to determine the rate law of the reaction.
Using the provided data, determine the affect of a catalyst on the reaction
Part II. Activation Energy and Temperature effects on reaction rates.
Using the class data, determine the activation energy of this reaction.
Complete the data and result tables, graphs, calculations and answer all required questions.
Complete a conclusion paragraph using the RERUNS method. A discussion of how to write a conclusion paragraph is given in Appendix D: How to Write a Formal Laboratory Report