Exam 3 - CHEMISTRY 116 Exam 3 Dr. T.R Chigwada July 26,...

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CHEMISTRY 116 Exam 3 Dr. T.R Chigwada July 26, 2007 An optical scoring machine will grade this examination. The machine is not programmed to accept the correct one of two or more sensed answers and will not sense answers that are lightly marked. Mark your sheet carefully with a No. 2 soft lead pencil and erase any undesired marks COMPLETELY . Avoid making any extraneous marks on the answer sheet other than the information mentioned below. On the answer sheet: 1. Print your name in the space for NAME (last name first, CIRCLE your last name). 2. In the space marked SUBJECT write Chem 116. 3. In the space marked TEST NO. write Exam 3. 4. In the space DATE write Summer 5. In the space marked PERIOD write Chigwada. 6. Check to see that you have 21 examination questions, a periodic table, and a scantron. Hand in only the answer sheet!! Useful Equations and Constants: R = 0.08206 L atm/mol K = 8.314 J/mol K 1 atm = 760 torr = 760 mm Hg K w = 1.0 x 10 -14 Relax and Good Luck !!!!! a ac - b -b x 2 4 2 ± =
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Page 2 1. Benzoic acid, HC 7 H 5 O 2 , has an ionization constant with the value: K a = 6.4 x 10 -5 . Calculate the value of pK b for the conjugate base of benzoic acid. A) 5.19 B) 4.35 C) 9.65 D) 9.81 E) 13.46 2. A 0.100 M solution of a weak acid , HA, has a pH = 2.00 . What is the value of the ionization constant, K a for this acid? (Hint: set up a concentration table) A) 1.1 x 10 2 B) 1.1 x 10 3 C) 1.1 x 10 4 D) 1.0 x 10 3 E) 1.0 x 10 4 3. What is the pH of a 1.00 x 10 9 M solution of HCl? A) 5.00
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Exam 3 - CHEMISTRY 116 Exam 3 Dr. T.R Chigwada July 26,...

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