178Exam2BKeyF06

178Exam2BKeyF06 - STACEY STOFFREGEN FALL 2006 CHEM 178 HOUR...

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STACEY STOFFREGEN CHEM 178 NAME FALL 2006 HOUR EXAM 2 RECIT. INSTR. RECIT. SECT. THIS EXAM CONSISTS OF 8 QUESTIONS ON 8 PAGES Teaching Assistants and Recitation Sections Name Section Time Alex Blom 2,5 9:00, 10:00 Sayantan Bose 3,9 9:00, 12:10 Beth Prince 1,4,6 8:00, 10:00, 11:00 Matthew Soyk 7,8 11:00, 12:10 PAGE POINTS SCORE 2 14 pts _________ 3 16 pts _________ 5 21 pts _________ 6 26 pts _________ 7 23 pts _________ TOTAL 100 pts _________ SHOW ALL OF YOUR WORK ON THESE EXAM PAGES. NUMERICAL ANSWERS SHOULD BE GIVEN IN THE CORRECT NUMBER OF SIGNIFICANT FIGURES AND UNITS. PUT YOUR ANSWERS IN THE ANSWER SPACES. THE LAST PAGE CONTAINS A PERIODIC TABLE. THIS SHOULD BE REMOVED AND USED FOR REFERENCE AND SCRATCH PAPER. THIS IS A CLOSED-NOTE, CLOSED-BOOK EXAM. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #6 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE COURSE WEBSITE
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2 Acid K a pKa HF 6.80E-04 3.167 HNO 2 4.50E-04 3.347 HC 7 H 5 O 2 6.30E-05 4.201 HC 2 H 3 O 2 1.80E-05 4.745 HCrO 4 - 3.70E-07 6.432 HClO 3.00E-08 7.523 HCN 4.90E-10 9.310 HC 6 H 5 O 1.30E-10 9.886 1. (5pts) Human blood is buffered at pH 7.4. A biochemist would like to prepare a buffer that mimics that of human blood. Use the information below to determine which of the following acids would be the most appropriate acid for the biochemist to use in preparing the buffer? From the Henderson-Hasselbach equation we know that buffers with the greatest buffering capacity utilize an acid or base that has a pK a value nearly equal to the desired pH of the buffer. Therefore, the best acid from this list to use to prepare a buffer with pH 7.4 would be HClO. 2. Circle all correct answers that apply to the following questions. a. (3pts) In the chemical equation,
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178Exam2BKeyF06 - STACEY STOFFREGEN FALL 2006 CHEM 178 HOUR...

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