Question
Karla Chemic obtained the following percent Fe values for her unknown during the Spectrophotometric Determination if Fe Lab in Quantitative Analysis: 11.2 %, 11.1 %, 11.3 %, 10.6 %. 11.1 %. 11.2 % and 11.9 %. What average percent Fe, standard deviation, and RSD should she report in her lab report? Be sure to explain or show how you came to this conclusion. Why is it important to make sure that cuvettes used during spectral measurements are free from smudges and fingerprints? Why is it important to make absorbance measurements for an analyte at the wavelength of maximum absorbance, i.e. a peak in the spectrum? There are 2 reasons here! UV-visible spectroscopy is often used to monitor chemical reactions. What does the presence of an isoseismic point in the spectrum recorded during the reaction indicate? What is the function of the monochromator in a spectrophotometer? What is the most common type of monochromator found in instruments today? What is the basis upon which it functions and how are wavelengths selected?
Explanation / Answer
Chemical and electrochemical techniques are presented for the analysis of Fe(VI) compounds used in super-iron electrochemical storage cells. Fe(VI) analytical methodologies summarized are FTIR, ICP, titrimetric, UV/VIS
