105B_lab quiz #2_spring07_key

105B_lab quiz #2_spring07_key - 105b Lab Quiz II 26 April...

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105b Lab Quiz II – 26 April 2007 Name:_________________________________________________________ Last 4 digits SID # __ __ __ __ TA: __________________________________ Please sign below : I certify that I have observed all the rules of academic integrity while taking this examination. Signature: ________________________________________________________________ Instructions 1. Use a #2 pencil to complete the scantron sheet. Circles must be completely filled in darkly. Any erasures should be made carefully. 2. Complete the following sections of the scantron sheet. a. Name: Last(Family), First, M.I. b. last 4 digits of SID #: boxes A-D c. TA special code: boxes N-P: TA code TA code TA code Aki Uchida 111 Jonathan Chen 622 Nan Shao 866 Betty Rogers 333 Kaori Noridomi 711 Shannon Howell 911 Daniel Ahn 444 Keriann Oertell 755 Siyi Wang 977 Jie Cao 555 Luis Gomez 822 Dr. Erickson 999 3. Your test booklet contains 15 multiple choice questions on 11 pages. Please check to see that you have a complete lab quiz. 4. This is a sixty minute exam. Scantrons modified after time is called will not be collected . When time is called, turn in the scantron sheet with the lab quiz booklet. Final Exam seating is by lab TA: Kaori, Siyi THH 102 Daniel, Jie, Keri, Nan THH 201 Aki, Betty, Jon, Luis, Shannon THH 101 Only the Scantron Form will be graded. Page 1 of 11 First letter of last name
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Exp. 6: The dissociation constant of a weak acid 1) Equal volumes of 0.500 M ammonium nitrate and 5.00 M ammonia are mixed together. What is the pH of the final solution? A) one plus the pK a for the ammonium ion B) one minus the pK a for the ammonium ion C) one D) one minus the pK b for ammonia E) one plus the pK b for ammonia 2) Which of the following methods cannot be used to produce a practical buffer solution? A) mixing a weak acid with a strong base. B) mixing a strong acid with a weak base. C) mixing a weak acid with a solution of the salt of its conjugate base. D) mixing a strong acid with a solution of the salt of its conjugate base. E) adding a strong acid to a solution of sodium bicarbonate because the bicarbonate ion can act as an acid. Only the Scantron Form will be graded. Page 2 of 11
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Experiment #7 – Potentiometric Titration The following cell is used to follow the progress of the titration of 100. mL of a 8.00 M solution of acetic acid with 1.00 M NaOH. The left beaker contains a platinum electrode immersed into a solution of 1.00 M nitrous acid, at 298K. Hydrogen gas at exactly 1 atm bubbles over the electrode. The right beaker contains a platinum electrode immersed into a solution of 8.00 M acetic acid at 298. K. Hydrogen gas at exactly 1 atm bubbles over this electrode. The Ka of nitrous acid is 4.00 x 10
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This note was uploaded on 08/21/2008 for the course CHEM 105BL taught by Professor Warshel during the Spring '07 term at USC.

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105B_lab quiz #2_spring07_key - 105b Lab Quiz II 26 April...

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