The document summarizes a laboratory experiment to create a calibration curve relating the absorbance and molarity of a potassium permanganate solution. Students created solutions of varying molarity by diluting a stock solution and measuring the absorbance of each solution using a spectrophotometer. Absorbance readings were then plotted against molarity to generate the calibration curve. Some points fell outside the linear regression and were removed from the graph, possibly due to imprecise measurement during solution preparation.