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HW 7 - Wright Jacqueline Homework 7 Due 11:00 pm Inst James...

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Wright, Jacqueline – Homework 7 – Due: Oct 29 2007, 11:00 pm – Inst: James Holcombe 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points The curve for the titration of formic acid (HCOOH) with NaOH(aq) base is given be- low. 0 2 4 6 8 10 12 14 0 20 40 60 80 100 120 140 Volume of base (mL) pH Estimate the p K a of formic acid. C a = 0 . 66, C b = 0 . 6072, and the volume of HCOOH is 100 mL. 1. None of these 2. 46 3. 92 4. 3 . 7 5. 8 . 37 002 (part 1 of 1) 10 points It required 25.0 mL of 0.333 M NaOH solution to completely neutralize 15.0 mL of H 2 SO 4 so- lution. What was the molarity of the H 2 SO 4 ? 1. 1.11 M 2. 0.200 M 3. 0.278 M 4. 0.555 M 003 (part 1 of 3) 10 points Below is the pH curve of a weak acid (HA) titrated with strong base. Answer the fol- lowing question based on the interpretation of this pH curve. Be as accurate as possible. 0 5 10 15 20 25 30 35 40 45 50 55 60 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Titration Curve Amount of Base added (mL) pH What is the pH at the equivalence point of this titration? Answer in units of pH. Your answer must be within ± 10%. 004 (part 2 of 3) 10 points How much base much be added to make the solution equalized? Answer in units of mL. Your answer must be within ± 10%. 005 (part 3 of 3) 10 points What is the p K a for this acid? Your answer must be within ± 5%. 006 (part 1 of 1) 10 points A student titrated a sample containing 104 mL of 0 . 27 M NaOH with 0 . 69 M HCl. What is the pH of the solution after 20 mL of the hydrochloric acid has been added?
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Wright, Jacqueline – Homework 7 – Due: Oct 29 2007, 11:00 pm – Inst: James Holcombe 2 1. 13 . 07 2. - 0 . 07 3. 0 . 93 4. 7 5. 14 . 07 007 (part 1 of 1) 10 points What quantity of 0.100 M NaOH would be required to titrate 300 mL of a 0.0200 M solu-
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