paraphrase

The purpose of the lab is to conduct the reaction between two solutions using different concentrations of reactants. The first solution of potassium iodide and the second one is iron (III) chloride. Then we have to determine the order of the reaction in KI and FeCl3. After that, we would determine the rate law expression for the reaction. The reason we can use the absorbance versus time data as our rate is because the slope of the graph is equal to the rate. The higher the absorbance, the higher the concentration is going to be.