EXAM 4 - Mantooth, Marlo Exam 4 Due: Apr 13 2007, noon...

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Mantooth, Marlo – Exam 4 – Due: Apr 13 2007, noon – Inst: Donna C Lyon 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. 001 (part 1 oF 1) 10 points A solution oF 100 mL oF 0.2 M NH 3 is titrated with 50 mL oF 0.5 M HNO 3 . What is the pH oF the resulting solution? K b For NH 3 is 1 . 8 × 10 - 5 . 1. 1.48 correct 2. 5.30 3. 10.3 4. 1.00 Explanation: 002 (part 1 oF 1) 10 points What is the pH oF an aqueous solution that is 0.10 M HCOOH ( K a = 1 . 8 × 10 - 4 ) and 0.10 M NaHCO 2 ? 1. 2.38 2. 3.74 correct 3. 10.26 4. 5.74 5. 5.62 Explanation: 003 (part 1 oF 2) 10 points 0 10 20 30 40 50 60 0 1 2 3 4 5 6 7 8 9 10 11 12 Titration Curve mL oF NaOH pH What is the pH at the equivalence point oF this titration? 1. 3 . 5 2. 5 . 17 3. 4 . 33 4. 10 . 27 5. 2 . 67 6. 6 . 43 7. 8 . 54 correct Explanation: The in±ection points are shown below.
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Mantooth, Marlo – Exam 4 – Due: Apr 13 2007, noon – Inst: Donna C Lyon 2 0 10 20 30 40 50 60 0 1 2 3 4 5 6 7 8 9 10 11 12 Titration Curve mL of NaOH pH (17 . 5, 4 . 33) (35, 8 . 54) 004 (part 2 of 2) 10 points What is the p K a of this acid? 1. 3 . 5 2. 4 . 33 correct 3. 8 . 54 4. 10 . 27 5. 2 . 67 6. 5 . 17 7. 6 . 43 Explanation: 005 (part 1 of 1) 10 points Consider the following data Compound K sp AuBr 5 . 0 × 10 - 17 CaCO 3 4 . 8 × 10 - 9 FeCO 3 3 . 5 × 10 - 11 AuCl 2 . 0 × 10 - 13 Which compound has the greatest molar solubility? 1. CaCO 3 correct 2. Cannot tell from the information given. 3. AuBr 4. AuCl 5. FeCO 3 Explanation: 006 (part 1 of 1) 10 points Adding(NH 4 ) 2 SO 4 topurewaterwouldresult in what kind of solution? 1. neutral 2. basic 3. acidic correct Explanation: 007 (part 1 of 1) 10 points A bu±er is composed of NH 3 and NH 4 Cl. How would this bu±er solution control the pH of a solution when a small amount of a strong base is added? 1.
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This note was uploaded on 09/28/2009 for the course GE 206E taught by Professor staff during the Spring '09 term at University of Texas.

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EXAM 4 - Mantooth, Marlo Exam 4 Due: Apr 13 2007, noon...

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