Do Calculation 1 on page 4 for [[]and [S2O82] initial concentrations, and record the results in the appropriate spaces in Data Table 2. (Refer to Table 1 on page 3 for concentrations and volumes.) Calculate the initial concentrations of iodide ion, persulfate ion, the average reaction time, and reaction rates just as you did in the experiment "Determining the Rate Law for a Chemical Reaction" under Calculations steps 1, 2, 3, and 4. Record your results in Data Table 2