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Fall 2009 Exam 3 Practice v1 _Zumdahl Chapters 8,9,10_ no answer key

# Fall 2009 Exam 3 Practice v1 _Zumdahl Chapters 8,9,10_ no answer key

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Practice Exam 3 v1 (Zumdahl Chapters 8, 9, 10) Page 1 1. Calculate the [H + ] in a solution that is 0.10 M in NaF and 0.20 in HF. ( K a = 7.2 x 10 –4 ) A) 0.20 M B) 7.0 x 10 –4 M C) 1.4 x 10 –3 M D) 3.5 x 10 –4 M E) none of these 2. You are given a solution of the weak base Novocain, Nvc. Its pH is 11.00. You add to the solution a small amount of a salt containing the conjugate acid of Novocain, NvcH + . Which statement is true? 3. Methyl orange is an indicator with a K a of 1 x 10 –4 . Its acid form, HIn, is red, while its base form, In , is yellow. At pH 6.0, the indicator will be 4. Which is the correct mathematical expression for the molar solubility (s) in mol/L (S) of Fe 3 (PO 4 ) 2 ? 5. Calculate the molar solubility of BaCO 3 ( K sp = 1.6 x 10 -9 ) in 0.10 M BaCl 2 solution. A) 1.6 x 10 –10 B) 4.0 x 10 –5 C) 7.4 x 10 –4 D) 0.10 E) none of these

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