Answer :
Based on the absorption spectrum, at the wavelength you should run the standards at 450 nm.
When all of the copper has precipitated out of solution, the usual method is to conduct a visual check. Pure copper(II) sulfate is described as white. It is also known as anhydrous copper(II) sulfate because it does not contain any water. When water is present, a copper(II) sulfate sample turns blue. Free iron, which is typically transferred onto a part's surface during manufacture with steel components, is found using the copper sulfate test. Copper(II) ions in solution absorb red light from the spectrum. The light that emerges from the solution will contain all the colors except for red. We see a light blue color when these particular wavelengths are combined.
Note that the full question is:
While testing a sample of copper (II) sulfate at varying wavelengths, you come up with a curve like the one found below. You still need to determine the concentration of the sample.
Based on this absorption spectrum, at which wavelength should you run the standards?
a) 450 nm
b) 550 nm
c) 650 nm
d)750 nm
To learn more about copper's wavelength: https://brainly.com/question/18459183
#SPJ4
