2009 (10-7) 1220-E2

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

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

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