105b_2006_e3_blank bau mak

105b_2006_e3_blank bau mak - 1 Chemistry 105b Name...

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Unformatted text preview: 1 Chemistry 105b Name Professors Bau & Mak Last 3 digits of SID# _____ _____ _____ Spring 2006 Lab T.A.'s Name Hour Exam 3 March 23, 2006 Lab Day & Time First Letter of Family Name Question Points Score Grader 1 18 2 22 3 10 4 6 5 8 6 6 7 20 8 10 TOTAL 100 Instructions: 1. There are a total of twelve (12) pages. Count the pages before you begin. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. Do not use blue pen or pencils. ACADEMIC INTEGRITY (Please sign below) : I certify that I have observed all the rules of ACADEMIC INTEGRITY while taking this exam. (signature) 2 Question #1 (18 points) (a) (8 pts) What is the pH of a buffer containing 0.258 M ammonium chloride (NH 4 Cl) and 0.147 M ammonia (NH 3 )? K b for NH 3 = 1.8 x 10 5 . (b) (6 pts) Calculate the molar solubility of Bi 2 S 3 in pure water (K sp for Bi 2 S 3 = 1.1 x 10 73 ) (c) (4 pts) Calculate the molar solubility of Al(OH) 3 in pure water (K sp for Al(OH) 3 = 2.0 x 10 32 ) 3 Question #2 (22 points) 625 mL of 0.375 M potassium acetate (KC 2 H 3 O 2 ) and 125 mL of 0.875 M hydrochloric acid (HCl) are mixed. (K a for acetic acid = 1.8 x 10 5 ). (a) (10 pts) Calculate the final pH of the mixture. (b) (12 pts) What are the final concentrations of [H + ], [OH ], [C 2 H 3 O 2 ], [HC 2 H 3 O 2 ], [K + ], and [Cl ] in the mixture? 4 Question #3 (10 points) What volumes of 0.5 M HNO 2 and 0.5 M NaNO 2 must be mixed to prepare exactly 1.00 liter of a solution buffered at a pH of 3.55? (K a for HNO 2 = 4.0 x 10 4 ). 5 Question #4 (6 points)...
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This note was uploaded on 02/27/2008 for the course CHEM 105BL taught by Professor Warshel during the Fall '07 term at USC.

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105b_2006_e3_blank bau mak - 1 Chemistry 105b Name...

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