2009_Midterm_1

2009_Midterm_1 - Exam Notes 2010 Be able to do calibration...

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page 1 of 9 printer 7234 Exam Notes: 2010 Be able to do calibration as in questions in the atomic chapter (today) Don’t worry about interferences or background correction techniques As always, for all chapters, be familiar with figures. No formula sheet Watch WebCT carefully for postings re. the exam. 287 Chemistry Salin Ch 20 Page 1
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page 2 of 9 printer 7234 Midterm 2 287 19 Nov 2009 Immediately…right NOW . Write your name on the Answer Sheet ! Do not unstaple the exam. Hand in the entire exam. Always keep the answer sheet (at the back) covered except when you are writing an answer. Do not leave that sheet exposed. You may be involved in cheating if you do! Be very careful to circle the correct answer on the answer sheet! You may use any page or the back of any page for scratch paper EXCEPT the answer sheet. Watch the time carefully. You will not be allowed to go beyond the end of the exam time period.
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page 3 of 9 printer 7234 1. A 100.0 mL solution of the ion Mn + at a concentration of 0.0500 M buffered to pH 10 was titrated with 0.0500 M EDTA. 4- for EDTA is 0.30 at pH 10.and the formation constant for (K f ) is 10 12.00 . What is the concentration of M n+ at V = V e . (This is problem 13-19 with a modified value of 0.3 instead of 0.041). The answer is -0. d.2.89 x 10 -7 V a. 7.81 x 10 -7 b. 7.81 x 10 -6 c. 8.33 x 10 -14 d.2.89 x 10 -7 e. 2.89 x 10 -6 g. 0.300 x 10 -12 2. The selectivity coefficient, k Li+,Na+ , for a lithium electrodes 5 x 10 -3 . When this electrode is placed in 3.44 x 10 -4 M Li + solution, the potential is – 0.222 V versus S.C.E. What would the potential be if Na + were added to give 0.100 M Na + ? Problem 15-19 with a modified value of -0.222 instead of -0.333.
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This note was uploaded on 07/15/2011 for the course CHEM 287 taught by Professor Burns during the Fall '08 term at McGill.

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2009_Midterm_1 - Exam Notes 2010 Be able to do calibration...

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