quiz3 - Version 193 – Quiz 3 – VANDEN BOUT –(53585 1...

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Unformatted text preview: Version 193 – Quiz 3 – VANDEN BOUT – (53585) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Which of the following mixtures gives a buffer with a pH less than 7.0? For acetic acid, K a = 1 . 8 × 10- 5 and for NH 3 , K b = 1 . 8 × 10- 5 . 1. 10 mL of 0.1 M aqueous acetic acid + 10 mL of 0.1 M NH 3 (aq) 2. 10 mL of 0.1 M aqueous acetic acid + 10 mL of 0.1 M NaOH(aq) 3. 10 mL of 0.1 M aqueous acetic acid + 5.0 mL of 0.1 M NaOH(aq) correct 4. 10 mL of 0.1 M NH 3 (aq) + 5.0 mL of 0.1 M HCl(aq) 5. 10 mL of 0.1 M NH 3 (aq) + 10 mL of 0.1 M HCl(aq) Explanation: 002 10.0 points What is the p K a of the acid titrated in this pH curve? 1 3 5 7 9 11 13 5 10 15 20 25 30 35 40 pH mL of OH- 1. 5.9 2. 4.7 3. 6.8 4. 5.6 correct 5. 9.0 Explanation: 003 10.0 points A 130 mL portion of 0 . 4 M acetic acid is be- ing titrated with 0 . 4 M NaOH solution. What is the pH of the solution after 120 mL of the NaOH solution has been added? The ioniza- tion constant of acetic acid is 1 . 8 × 10- 05 ....
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This homework help was uploaded on 04/16/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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quiz3 - Version 193 – Quiz 3 – VANDEN BOUT –(53585 1...

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