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2009 (10-7) 1220-E2

2009 (10-7) 1220-E2 - TAs Name Chem 1220 Fall 2009 Exam 2...

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TA’s Name: ______________________ Chem. 1220 Fall 2009 Exam # 2 October 7, 2009 Name: _________________________________ UID # _________________________________ Signature: ____________________________
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1. A 100.0- mL buffer solution is 0.175 M in HClO and 0.150 M in NaClO. K a (HClO) = 2.9 x 10 -8 (10 points) a) What is the initial pH of this solution? (10 points) b) What is the pH after addition of 150.0 mg of HBr? (12 points) 2. Two 25.0-mL samples, one 0.100 M HCl and the other 0.100 M HF, were titrated with 0.200 M KOH. Answer each of the following questions regarding these two titrations. Without doing any calculation.
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a) The volume of added base at the equivalence point for titration of HCl is (more, less, same) compared to that of HF? b) Predict whether the pH at the equivalence point for each titration will be acidic, basic, or neutral. c) Predict which titration curve will have the lower initial pH. d) Make a rough sketch of each titration curve. (8 points) 3. Determine whether or not each of the following compounds will be more soluble in acidic solution than in pure water. Explain. a) BaCO 3 b) CuS c) AgCl d) PbI 2
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4. Predict whether or not a precipitate will form upon mixing 75.0 mL of a
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