Pre-lab Quiz#9 - the original sample, the mass of...

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1. Titrimetry   In figuring out if EDTA titration is a viable approach, you determine that use of 0.03 M EDTA will require  between 15 mL and 30 mL to reach the endpoint. This means:    Student Response Value Correct Answer Feedback 1.  Because of the high  concentration of  EDTA required, EDTA  titration is not a viable  approach to this lab. 0%       2. Because the titrant  volume is so small,  EDTA titration is not a  viable approach to  this lab.      3. This is a combination  of parameters that  may very well allow  for EDTA titration to  give good precision  and accuracy.      4. This is a bad  combination of  parameters, but the  reasons given  previously don't  describe what is  wrong.      Score: 1/1    2. Gravimetry   In doing calculations concerning precipitation with dimethylglyoxime (DMG), you determine that if you use 1/4 of 
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Unformatted text preview: the original sample, the mass of precipitate expected is 0.01 g. As a consequence, Score: 1/1 3. Gravimetry II In doing calculations concerning precipitation with dimethylglyoxime (DMG), you determine that if you use 1/4 of the original sample, the mass of precipitate expected is 1.25 g. As a consequence, Score: 1/1 4. Spectrophotometry You calculate the absorbance expected for a sample made by using 1/10th of the unknown sample, and it works out to 14.3. As a result: Score: 1/1 5. Interferences You know your sample is contaminated with MgCl 2 . As a result: Score: 1/1...
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This note was uploaded on 01/06/2011 for the course CHEM 223 taught by Professor Scheeline during the Fall '08 term at University of Illinois at Urbana–Champaign.

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Pre-lab Quiz#9 - the original sample, the mass of...

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