Peroxydisulfate ion oxidizes iodide ion to triiodide ion, I3-. The reaction is S2O82-(aq) + 3I-(aq) 2SO42-(aq) + I3-(aq) How is the rate of reaction that is expressed as the rate of formation of I3related to the rate of reaction of I-?Calculate the average rate of formation of O2 in the following reaction during the time interval from 1200 s to 1800 s. At 1200 s, [O2] = 0.0036 M; at 1800 s, [O2] = 0.0048 M.a.The slope at point A is greater than the slope at point B, so the instantaneous rate at point A is greater than the instantaneous rate at point B.b.No. If it were, the graph would be linear.Rates are determined experimentally in a variety of ways. For example, samples can be taken and analyzed from the reaction at several different intervals. Continuously following the reaction is more convenient. This can be done by measuring pressure, as shown on the next slide, or by measuring light absorbance when a color change is part of the reaction.The reaction rate usually depends on the concentration of one or more reactant. This relationship must be determined by experiment.This information is captured in the rate law, an equation that relates the rate of a reaction to the concentration of a reactant (and catalyst) raised to various powers. The proportionality constant, k, is the rate constant.