The following data was obtained for cobalt (II) nitrate. concentration: 0.10 absorbance: 0.47 concentration: 0.15 absorbance: 0.71 concentration: 0.40 absorbance: 1.89 18. When the same solution and cuvette are used, the absorptivity 1 point coefficient and path length will be (constant or variable). constant variable 19. This leaves absorption and concentration as the only remaining variables 1 point in Beer's Law. A graph of these two variables will be (see the bottom of page 4 if you are unsure) curved linear 20. Open google sheets, excel, or any graphing program. Using the data 1 point: above graph the absorbance versus concentration. Is your graph linear? Yes No Maybe A student uses a UV-VIS spectrometer to measure the absorbance of several CuSO4 solutions at different concentrations as shown in the graph below: 1. With what you saw in the Beer's Law simulation, determine the absorbance of a solution of CuSO4 at 0.250M ? (Hint: Find the slow of the line first) (2pts) 2. Explain why using this technique would work for a solution made from CoCl2 (shown at left) but not for a solution made from NaCl (shown at right)? (2pt) Cobalt (II) chloride Sodium Chloride