exam 3 green S08

exam 3 green S08 - CHM l3l2z General Chemistry 2, Spring...

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Unformatted text preview: CHM l3l2z General Chemistry 2, Spring 200g EXAM #3, April l, 2008 CodeName lprint] @ Class section (circle the correct one): Instructor Section # Class time a. Sibert 001 9:30 to 10:20 am b. Dieckmann 002 10:30 to 11:20 am CHM 1312: Exam #3 . Page 3 of 12 April 1,2008 CodeName CHM l3l2: General Chemistry 2, Spring 2008 Exam #3, April 1,2008 CodeName (print) V,9\ Potentially Useful Information Avogadro's number :6.022 x 1023 R: 0.0821 L atm mol-l K-l : 8.314 J mol-l K-l DO NOT WMTE IN THESE BLANKS Problems 1 thru 22: multrple choice: . no partial credit . put answers on scantron sheet AND circle answers on this exam . work can be put on blank sheets provided Problems 23 thru 26: short answer: . show all work to get full or partial credit Points: 23. (r4) 24. (7) I thru 22. (69) 2s. (10) TOTAL (100) CHM l3l2: Exam #3 Page 4 of 12 A p r i l 1 , 2 0 0 8 1. (4 pts) The acid-dissociation constants of sulfurous acid (HzSOl) &re K61 :1.7 x l0-2 and Ku2 = 6.4 x l0-8 at25 "C. Determine the pH of a 0. 163 Maqueous solution of H2SO3 at equilibrium: a. 4.5 b . 1 . 4 c . 1 . 8 4.. 7.2 ,-r\ ( ".)r.t \J 2. (2 pts) Which of the following salts is the LEAST soluble in water?-\ ( i./nuson (K,p = 1.0 x to-'o) \J 1. agct (Krp : 1.6 x 1o-lo; c. BaCO3 (Krp = 9.1 x 10-e; d. CuBr (Krp :4 x tO-8) e' PbSOa (Krp : 1.1 x l0-8) coa.Na.e (9-{ 3. (3 pts) HA a . b . is a weak HA (aq) A- (aq) HA (aq) A- (aq) A- (aq) acid. which equilibrium corresponds to the equilibrium constant K6 for A-? + HzO (l) : HzA* (aq) + OH- (aq) + H:o* (aq) # HA (aq) + H2o (l) + oH- (aq) # Hzo (l) + H* (aq) + HzO (l) === HA (aq) + OH- (aq) + OFf (uq) <: HOA2- (aq) c . fv e . 4. (4 pts) Calculate the pH of a solutio n at 25 oC in which the concentration of Ba(OH)2 is 0. 10 I42 a. 0.70 b. r2.0 c. 0.20 d . 0 . 1 0 D- I e\none of these \-/ 5. (2 pts) Classifu the following compounds as weak (W) or strong (S) perchloric acid c . S W W d ....
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exam 3 green S08 - CHM l3l2z General Chemistry 2, Spring...

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