chem_126_2010_Common_2_w332q

chem_126_2010_Common_2_w332q - Chem 126 Exam 2 March 26,...

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Chem 126 Exam 2 March 26, 2010 Ellis NONE OF THE MULTIPLE CHOICE PROBLEMS REQUIRES EXTENSIVE OR TIME COMSUMING CALCULATIONS. IF YOUR METHOD REQUIRES EXTENSTIVE CALCULATIONS IT IS EITHER WRONG OR HARDER THAN WHAT IS REQUIRED. 1. A 0.1 M solution of each acid in the table is prepared. Which has the HIGHEST pH. Careful. a. Acetic b. Fluoroacetic c. Formic d. Hydrocyanic e. Hydrofluoric 2. 2.5 g NaOH is diluted to 5.0 L. What is the pH? a. 1.90 b. 12.1 c. 0.30 d. 13.7 e. 13.17 3. 100.0 mL of 0.45 M HNO 3 is mixed with 200. mL of 0.55 M HCN? What is the pH? a. 0.00 b. 0.26 c. 0.35 d. 0.48 e. 0.82 4. 60.0 mL of 0.30 M HNO 3 is mixed with 40. mL of 0.20 M HCl? What is the pH? a. 0.74 b. 0.59 c. 0.93 d. 1.10 e. 0.52
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Chem 126 Exam 2 March 26, 2010 Ellis 5. 15.0 mL of 0.62 M HCl is mixed with 80. mL of 0.10 M KOH. What is the pH? a. 1.86 b. 1.79 c. 1.06 d. 1.01 e. >10 6. What is the hydrogen ion concentration of a 0.77 M HF? K a = 6.76 x 10 -4 M. a. < 0.01 M b. 0.011 M c. 0.022 M d. 0.68 M e. 0.77 M 7. A 0.0019 M solution of a weak acid, HB, has a pH of 3.30. What is K a ? a. 1.8x10 -4 M b. 1.3x10 -4 M c. 2.5x10 -7 M d. >10 -2 M e. <10 -8 M 8. Which of the following ions is neutral?
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This note was uploaded on 03/30/2012 for the course CHEM 126 taught by Professor Biolsi during the Spring '08 term at NJIT.

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chem_126_2010_Common_2_w332q - Chem 126 Exam 2 March 26,...

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