The wavelength should be 600 nm to minimize the interference from the presence of the CO{2+} ions (aq).
What is spectrophotometer?
An analytical tool called as spectrophotometer is used to determine the emission or reflection of visible light, UV light, or infrared light objectively. These are used to calculate intensity as a function of light source wavelength.
The spectrophotometer available to the student has a wavelength range of 400 nm to 700 nm. The maximum wavelength for CO{2+} curve is 500 nm. The two curves of CO{2+} and Cu{2+} intersects at 600 nm.
So, 600 nm should the student use for interference minimization for the presence of CO{2+} ions.
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