Chemistry Reference
In-Depth Information
Data Table 2
Sample
% Absorbance
0 M CuSO
4
0.0
0.25 M CuSO
4
0.5 M CuSO
4
0.75 M CuSO
4
1.0 M CuSO
4
Unknown
Analysis
1. Describe the appearance of the five solutions you will test in this
experiment.
2. Which solution do you think will have the lowest light absorbance?
The highest? Why?
3. Why was it necessary to use a “blank” cuvette containing only
distilled water in this experiment?
4. Graph the results of this lab using the information from Data
Table 2. The molarity is the dependent variable (X-axis) and the
absorbance is the independent variable (Y-axis). Plot the molarity
versus absorbance for the known solutions using dots, and then
connect them with lines.
5. How is the molarity of copper (II) sulfate related to the absorbance
of light that passes through it?
6. How do your results compare with your prediction in Analysis
question 2? Were the results as you expected?
7. Using the line created from your known data on your graph, plot the
absorbance of the unknown solution and determine the molarity
based on its location on the line graph. What was the molarity of the
unknown solution?
