The instructor will Illustrate how concentration measurements are made using a S

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The instructor will Illustrate how concentration measurements are made using a Spec 20, See Appendix 3. Solution A-1 contains only Fe(NO_3)_3 and HNO_3, Because no KSCN is present, no Fe(SCN)^2+ is produced. This solution is used as the reference sample. Why don't we use water as the reference sample? Spectroscopy is an analytical method for measuring concentration of a substance in solution. For a given substance the amount of light absorbed depends on the concentration of the absorbing molecules in the sample, the path length, the wavelength of light and the solvent. According to Beer's Law, the absorbance of light A, is directly proportional to the concentration of the absorbing sample, A c.

Explanation / Answer

3- water can not be used as reference sample as it shows zero absorbance for radiation used in this experiment.

4- what have to answered???

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