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Practice exam 2 fall 2010

Practice exam 2 fall 2010 - Exam#2 Chemistry 112 Name...

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1 Exam #2 Chemistry 112 Name: _______________________________ Social Security Number: XXX-XX-________ Seat Number: _____________________ For ALL pH questions, express the answer to 2 decimal places !!! 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 NH 3 solution, K b = 1.8 x 10 -5 , 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) 70 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) 70 mL of HCl have been added
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6 2) (5 points) What is the pH of a 4 M Ba(OH) 2 solution? 3) (10 points) The pH of a 0.3 M pyridine (C 5 H 5 N) solution is 9.39. Calculate the K b for pyridine. 4) (5 points) List the following species from most basic to most acidic. Circle the most acidic species. KCl, HNO 3 , Ba(OH) 2 , NH 4 Cl, KF
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7 5) (10 points) The K a for hydrofluoric acid, HF, is 3.5 x 10 -4 . Calculate the pH of a 0.1 M NaF solution.
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