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209nightfinal - CHEM 209- Night Final Exam NAME 1(30...

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Unformatted text preview: CHEM 209 -» Night Final Exam 10/5/04 NAME: 1. (30 POINTS) Suppose a student is determining the total base content of an antacid tablet by performing a back titration. He/she weighs out a 0.5022~gram portion of a tablet whose total weight is 1.6335 grams, dissolves this in exactly 30.00mL of deionized Water, and then adds exactly 40.00 mL of 0.0950M HCI on order to bring the pH down to 2.2. This solution is then carefully back-titrated with 0.1050M NaOH, with 6.77 mL required to reach the equivalence point. Calculate the total base content (i.e., the number of mmoles of base contained) of the antacid tablet. SHOW ALL WORK CLEARLY. 2. (30 POINTS) (a) Write the equation for Beer’s Law and define all the terms (including the correct units for each term). (b) The absorbance of a 1.0 x 10‘5M Fe(1,10-phen)32+ solution is measured ata wavelength of 510 nm and found to be 0200. What is the transmittance of this solution? SHOW YOUR WORK. (0) Suppose the solution in part (b) is diluted with deionized water by a factor of 2. What are the absorbance and transmittance of the diluted solution? SHOW YOUR WORK. 3. (20 POINTS) What quantities are plotted on the x— and y—axes of: x-axis -axis (a) a chromatogram? (b) an absorption spectrum? 4. (20 POINTS) Define the term “retention time”. What is its principal use in GC analysis? BONUS QUESTION (10 POINTS) What detector was used in the GC experiment? Briefly explain its operating principle. ...
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