103B Exam 2-C - Exam I master Page 1 Chemistry 103B Exam 2...

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Page 1 Exam I master 4/10/2008 12:21:01 AM http://www.chem.arizona.edu/~kellerp/exams/Exam2/exam2Can/Exam2Can.htm Chemistry 103B Exam 2 Answer Key Form C 1. (2) What is [H 3 O + ] for a solution that has pOH = 14.47? (a) 8.4 M (b) 2.3 x10 -4 M (c) 0.39 M (d) 2.95 M (e) 4.3 x10 -11 M Definitions of pOH and pH. pH = 14.00 pOH = -0.47 [H 3 O + ]=10 -pH =10 0.47 = 2.95 HBrO 3 (aq) is a strong acid . The next fivequestions involvewatersolutions of either this acid or of its conjugatebase. 2. (2) What is the pH of a 0.00030mol/L solution of HBrO 3 (aq)? (a) 0.30 (b) 3.52 (c) -0.20 (d) 13.97 (e) 1.52 Since it is a strong acid, it is 100% dissociated. The concentration of hydrogen ion is 0.00030 mol/L. From the study outline: "Calculation of the equilibrium concentrations of all solution species in problems involving strong acids or bases. This includes finding pH." 3. (2) What is the pH of a 0.00030mol/L solution of NaBrO 3 (aq)? (a) 1.52 (b) 0.30 (c) 13.97 (d) -0.69 (e) 7.00 BrO 3 - is the conjugate base of a strong acid, and therefore not a base. The solution is neutral. The sodium ion is just a "spectator ion." From th stud outlin " Know tha ioni compound meta -nonmeta ar alway
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Page 2 Exam I master 4/10/2008 12:21:01 AM http://www.chem.arizona.edu/~kellerp/exams/Exam2/exam2Can/Exam2Can.htm From the study outline: " Know that ionic compounds (metal-nonmetal) are always 100% ionized (dissociated into ions) in solution." And "Calculation of the equilibrium concentrations of all solution species in problems involving strong acids or bases. This includes finding pH." 4. (2) What is [OH - ] of a 0.00030mol/L solution of NaBrO 3 (aq)?
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This test prep was uploaded on 04/10/2008 for the course CHEM 103B taught by Professor Keller during the Spring '08 term at University of Arizona- Tucson.

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103B Exam 2-C - Exam I master Page 1 Chemistry 103B Exam 2...

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