Specifically, you are to prepare a graph of Absorbance versus [Co2+] for the following solutions -- prepared by diluting the specified volumes of 0.2500 M Co2+ stock solution to 25.00 mL each:

Volume	Absorbance
0.00 mL	0.000
2.50 mL	0.165
5.00 mL	0.320
7.50 mL	0.485
10.00 mL	0.610
12.00 mL	0.721

I am not sure how to create a graph if the concentration is already given, but the different volumes are also given.