can someone please help me?

Question

The wavelength max in this experiment is 615 nm, corresponding to the color orange. The copper (III) solution is certainly not orange in color. explain

and

A 0.85 cm cuvette is mistakenly substituted for a .80 cm cuvette. When the percent transmission for the solution in the "too large" cuvette is taken, will it be higher, lower, or the same as it would be in a proper sized cuvette? Explain

Answer 1

since the cuvette will be longer, u will ahve more substance to absorb, hence the absorbance will be higher, therefore, the transmission-lower.
the 615nm correspond indeed to orange. and since copper does not exist as copper (iii) this explains the experimental result.

Answer 2

I would need more info on the matrix of your solution; interference can be an issue.

In regards to the 0.85 vs 0.80 length of the cuvette - remember the Beer Lambert Law:

ln (I/Isub0) = kLC where k is a proportionality constant, L is path length, C = concentration If you increase path length there will be less light intensity exiting (more absorbed).