Practice Exam _2

Practice Exam _2 - Exam#2 Chemistry 112 Spring 2009 Name...

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1 Exam #2 Chemistry 112 Spring 2009 Name: _______________________________ Last 4 digits of Student ID Number:_______________ For ALL questions, express the final answer to 2 decimal places! Failure to do so will cost ONE POINT for each occurrence! Write Neatly! Show ALL work!
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2 1) (50 points) Titration: This is a multi-step problem: Calculate the pH for the titration of 100 mL of a 0.1 M pyridine (C 5 H 5 N) solution, K b = 1.8 x 10 -9 , with 0.2 M HCl after: a) (10 points) 0 mL of HCl have been added b) (12 points) 30 mL of HCl have been added c) (16 points) 50 mL of HCl have been added d) (12 points) 100 mL of HCl have been added a) 0 mL of HCl have been added
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3 b) 30 mL of HCl have been added
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4 c) 50 mL of HCl have been added
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5 d) 100 mL of HCl have been added
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6 2) (8 points) What is the is the molarity of a Sr(OH) 2 solution with pH = 13 ? 3) (10 points) The pH of a 0.1 M hydroxylamine (NH 2 OH) solution is 9.52. Calculate the K b for hydroxylamine. 4) (5 points) List the following species from most basic to most acidic. Circle the most acidic species.
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This note was uploaded on 02/21/2012 for the course CHEM 112 taught by Professor Chen during the Spring '09 term at South Carolina.

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Practice Exam _2 - Exam#2 Chemistry 112 Spring 2009 Name...

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