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chem_126_2009_Common_2_aB1122z

chem_126_2009_Common_2_aB1122z - Chem 126 Exam 2 2009 NONE...

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Chem 126 Exam 2 2009 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. Which of the acids in the table is the strongest acid? a. Acetic b. Fluoroacetic c. Formic d. Hydrocyanic e. Hydrofluoric 2. 14 g HNO 3 is diluted to 250 mL. What is the pH? 3. 50.0 mL of 0.35 M HBr is mixed with 100. mL of 0.09 M HI? What is the pH? 4. 50.0 mL of 0.50 M HF is mixed with 50. mL of 0.20 M HCl? What is the pH?
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5. 75.0 mL of 0.60 M HCl is mixed with 200. mL of 0.20 M Ba(OH) 2 . What is the pH? a. 13.10 b. 0.90 c. 1.74 d. 12.26 e. 10.78 6. What is the pH of a 0.64 M HCN? K a = 4.79 x 10 -10 M. 7. A 0. 33 M solution of a weak acid, HB, has a pH of 5.35? What is K a ?
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