(Note: All wavelengths are measured in nanometers, unless specified otherwise.)
From this, we can gather that the wavelength ranges absorbed by the various solutions to be as follows: Cobalt(II) Chloride (400-550 nm), Nickel(II) Chloride (410-480 nm, 610-800 nm), Iron(III) Chloride (380-570 nm), Copper(II) Chloride (670-900 nm), Sodium Chloride (none), and Water (also none).
The goal of this experiment is to properly measure the absorption spectra of a series of solutions, by properly using a spectrometer, and by using a color chart to generate a rough measurement.
(Calculation of error not possible due to lack of accepted absorption values for the solutions measured.)
The wavelength ranges absorbed by the various solutions are as follows: Cobalt(II) Chloride (400-550 nm), Nickel(II) Chloride (410-480 nm, 610-800 nm), Iron(III) Chloride (380-570 nm), Copper(II) Chloride (670-900 nm), Sodium Chloride (none), and Water (also none).
Possible sources of error include:
- Failure to properly clean the cuvettes.
- Contamination of cuvettes while handling them.
- Contamination of solutions used, thus altering them from their formula and concentration.
- Contamination or other error, relating to the spectrometer (such as smudging the lens).
- Failure to generate a proper graph, due to lack of knowledge of the directions.
- Human error is always in effect, given that the laboratory does not function under ideal conditions. As such, there is always the possibility of inaccuracies with measurement, perception of measurement, inaccuracies of equipment, and other such errors. (However, this is not likely to be the sole cause of the inaccuracies within this experiment, though it may contribute to it.)
Possible improvements to this experiment include testing each solution multiple times (to average out their absorption spectra), using crystal cuvettes and using a more accurate spectrometer.