A FeSCN complex, whose maximum absorbance is at a λ of 580 nm, has a molar extinction coefficient of 5×103 M-1cm-1 . A solution is measured with a 25 mm cell at the same λ , obtaining 20.6% T. Calculate the concentration in [ppm] of the complex in the solution.

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.