Laboratory Report_chem2.docx - Laboratory Report Group Lab...

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Laboratory Report ( Group Lab Report) Name : Noah Weiss Partner’s name : Anh Nguyen Spectrophotometric Determination of Commercial Aspirin I. Abstract II. Answers for Pre-Lab questions 1. A=abc. a/b are constants that allow the proportionality between (A-c) to be converted to an equation. a- is known as absorptivity. b(cell thickness) - is identical to the pathlength of radiation through the cell, commonly 1.00 cm (size of cuvette). c- is the concentration of the solution (molarity). 2. Any unused reagent is to be put into a labeled waste container. You can also add phenolphthalein and neutralize with 6M H2SO4 or HCl. At first appearance of pink color you can flush the salt solution down the sink with running water. 3. Adding the iron(III) ion yields the soluble [tetraaqua salicylato iron(III)] complex ion. The complex ion in solution has a very high molar absorptivity, which allows it to be used as a sensitive indicator for the presence of salicylate. In other words the iron turns the solution a purple color with a wavelength absorbance of 530 (nm) 4.

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