Discussion/Conclusion:

The purpose of this lab was to figure out how you can determine the concentration of a colorful solution.The experiment involved five solutions with known solutions were used to determine the solution of a copper(II) sulfate solution with an unknown concentration. The concentrations of the five solutions were determined by the colorimeter and after we had them all, a graph was created comparing absorbance with concentration. A trend line was fitted to the graph to help determine the equation of the line. Once the equation was calculated, it was used to find the concentration of the unknown solution. We found the concentration of the unknown solution to be 0.205 M. This was calculated by diving the absorbance by the slope of the line. The calculations were accurate because the equations was determined by excel and the graph showed where the concentration would most likely be. In the future to make this lab better, the instructor could provide the students with the concentration of the unknown after it was solved for to see if the results were correct. If they were not, percent error could be calculated.