SPE: Spectrophotometric Determination of Copper
Before coming to lab, you should:
Show all
calculations. Report all answers to the
correct number of significant figures and with the correct units.
1. (1 pt)
A solution absorbs light at 454 nm. What color
light is being absorbed?
2. (4 pts) Outline in 5 short steps how to calibrate a Spec 20.
3. (1 pts) How many mL of a 2.50 M solution of Na2SO4 are needed to make 250 mL of 0.250 M solution of Na2SO4?
5. (4 pts) This lab will familiarize you with preparing a Beer’s Law Plot, which is prepared by plotting _____________ vs. _____________. Briefly explain, in three steps, how you will use this graph to find the concentration of an unknown copper solution.