Homework 07 - Gadhia, Tejas Homework 7 Due: Oct 29 2007,...

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Gadhia, Tejas – 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 – fnd all choices beFore answering. The due time is Central time. 001 (part 1 oF 1) 10 points The curve For the titration oF cyanic acid (HOCN) with NaOH(aq) base is given below. 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 cyanic acid. C a = 0 . 66, C b = 0 . 528, and the volume oF HOCN is 100 mL. 1. 8 . 23 2. None oF these 3. 3 . 5 4. 80 5. 40 002 (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. 0.200 M 2. 1.11 M 3. 0.555 M 4. 0.278 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 107 mL oF 0 . 28 M NaOH with 0 . 69 M HCl. What is the pH oF the solution aFter 22 mL oF the hydrochloric acid has been added?
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Gadhia, Tejas – Homework 7 – Due: Oct 29 2007, 11:00 pm – Inst: James Holcombe 2 1. - 0 . 07 2. 0 . 93 3. 13 . 07 4. 7 5. 14 . 07
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Homework 07 - Gadhia, Tejas Homework 7 Due: Oct 29 2007,...

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