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

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Page 1 Exam I master 4/10/2008 12:20:21 AM http://www.chem.arizona.edu/~kellerp/exams/Exam2/exam2Aan/Exam2Aan.htm Chemistry 103B Exam 2 Answer Key Form A 1. (2) What is [OH - ] for a solution that has pH = 14.85? (a) 7.1 M (b) 2.3 x10 -4 M (c) 0.14 M (d) 4.4 x10 -9 M( e ) 4 . 3 x 1 0 -11 M Definitions of pOH and pH. pOH = 14.00 14.85 = -0.85 [OH - ]=10 -pOH =10 0.85 = 7.1 mol/L Hydrobromic acid, HBr(aq), is a strong acid . The next five questions involve solutions of this acid or its conjugate base, bromide ion. 2. (2) What is the pH of a 0.0020mol/L solution of HBr(aq)? (a) 2.30 (b) 2.70 (c) -0.27 (d) 0.080 (e) -0.69 Since it is a strong acid, it is 100% dissociated . The concentration of hydrogen ion is 0.0020 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 0.0020mol/L solution of NaBr(aq)? (a) 0.69 (b) 0.30 (c) -0.20 (d) -0.69 (e) 7.00 Br - 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 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."
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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-A - Exam I master Page 1 Chemistry 103B Exam 2...

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