Exam3Key - CH201-001 SSII 2009 Exam 3 Name:_ Last First...

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CH201-001 SSII 2009 Name:____________________________________ Exam 3 Last First Instructions: 1) Clearly write name on each page 2) All work must be shown for full credit 3) There is a ± 1 digit tolerance for significant figures 4) Be sure answers have proper significant figures AND units N A = 6.02 x 10 23 mol -1 R = 8.314 Jmol -1 K -1 F = 96,485 C/mol e - Charge = i x t ln [A] = ln [A] 0 - kt = + kt 1 [A] 1 [A] 0 E = E o cell - log Q 0.0592 V n E o cell = log K eq 0.0592 V n E o red (V) Al 3+ + 3 e 1- Al (s) -1.66 Cd 2+ + 2 e 1- Cd (s) -0.40 Ni 2+ + 2 e 1- Ni (s) -0.23 Sn 2+ + 2 e 1- Sn (s) -0.14 2H 1+ + 2 e 1- H 2 (g) 0.00 Cu 2+ + 1 e 1- Cu 1+ +0.16 Cu 2+ + 2 e 1- Cu (s) +0.34 Au 3+ + 3 e 1- Au (s) +1.50
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CH201-001 SSII 2009 Name:____________________________________ Exam 3 Last First 1. Circle the compound from the following list that will precipitate at the lowest pH. Cd(OH) 2 Ca(OH) 2 Pb(OH) 2 Mn(OH) 2 K sp 2.5x10 -14 5.5x10 -6 2.8x10 -16 1.9x10 -13 2. A saturated solution of Mg(OH) 2 has a pH of 10.38. Calculate K sp and molar solubility of Mg(OH) 2 . What is the new molar solubility if the pH increases to 11.50? pOH = 14 – pH
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This note was uploaded on 01/27/2011 for the course CHEM 201 taught by Professor Wilson during the Spring '10 term at N.C. Central.

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Exam3Key - CH201-001 SSII 2009 Exam 3 Name:_ Last First...

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