Beer's Law Lab, but It Isn't About Beer, Just Concentration, but Not That Concentration Like Focus, It's About Solutions and Their Concentration, but Not Solutions Like Solutions to a Problem. . . .

The main point of this lab was to determine the concentration of an unknown solution. In order to do this we:

1.   Added 30mL of .40 NiSo4 solution into a beaker, and 30mL of water into a separate beaker.

2.   We took four clean test tubes and labeled them 1 through 4. Then, with a pipet, we put 2, 4, 6, and 8 mL of .4 M NiSO4 solution into test tubes 1-4 respectively. We repeated the process with water putting 8, 6, 4, and 2 mL of distilled water into Tubes 1-4 respectively. Then stir!

3.   On a computer, open the LoggerPro file "Exp 11 Colorimeter."

4.   Calibrate the Colorimeter

5.   Fill a cuvette 3/4 full of the solution from test tube 1. Then place it in the Colorimeter and collect the data on LoggerPro.

6.   Repeat these steps for test tubes 2-4. Afterwards, take a sample of the .40 M NiSO4 solution and record its data as well. 

7.   Examine the data by clicking the Linear Regression button, this will then but a line of best fit into the graph.

8.   Once this is finished, find the beaker of unknown solution, or in this case, the three bottles. Test each of these samples in the Colorimeter. With the information you gain from testing each of these samples you should be able to determine the concentration of each solution. 

For Unknown Solution #1, we found an absorbance of .248. Plugging that number into our graph above means that the mystery solution has a concentration of about .1474 mol/L.

For Unknown Solution #2, there was an absorbance of .558. That means that the solution had a concentration of about .3676 mol/L/

Finally, for Unknown Solution #3, there was an recorded absorbance of .430, meaning that the solution's concentration was around .2602 mol/L.