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ANSWERS_CHAPTER_16_CHEM1B

ANSWERS_CHAPTER_16_CHEM1B - Answers to Chapter 16 Homework...

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Answers to Chapter 16 Homework 16.34 A buffer solution contains a conjugate acid-base pair in about equal concentrations. (a) 1, 3, and 4 (b) 4 because it has the highest buffer concentration. 16.38 (a) (i) (1), only B present (ii) (4), equal amounts of B and BH + present (iii) (3), only BH + present (iv) (2), BH + and H 3 O + present (b) The pH is less than 7 because BH + is an acidic cation. 16.39 (2) is supersaturated; (3) is unsaturated (4) is unsaturated 16.49 Weak Acid-Weak base reaction Kn = 3.4 16.51 NH 3 (aq) + H 2 O( l ) NH 4 + (aq) + OH - (aq) (a) The pH increases (b) The pH decreases (c) The pH decreases (d) KBr does not affect the pH of the solution
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16.57 Before: pH = 11.37 After addition of 4.0g of Ammonium Nitrate: pH = 9.04 16.59 Solutions (b), (c), and (d) are buffer solutions. Neutralization reactions for (b) and (d) result in solutions with equal concentrations of NH 3 and NH 4 + . 16.67 For the buffer pH = 6.98 (a) pH = 6.97 (b) pH = 6.98 16.75 The buffer system of choice for pH = 4.50 is (c): C 6 H 5 CO 2 H C 6 H 5 CO 2 - 16.77 See lecture or textbook notes for plot (a) (a) pH = 14 (b) At equivalence point pH = 7 (c)
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