Chapter_14_Homework_Key

# Chapter_14_Homework_Key - Chapter 14 Homework Solutions 28...

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Chapter 14 Homework Solutions 28. Write the dissociation reaction and the corresponding K a equilibrium expression for each of the following acids in water. a. HCN b. HOC 6 H 5 c. C 6 H 5 NH 3 + 29. For each of the following aqueous reactions identify the acid, the base, the conjugate acid, and the conjugate base. a. H 2 O + H 2 CO 3 H 3 O + + HCO 3 - b. C 5 H 5 NH + + H 2 O C 5 H 5 N + H 3 O + c. HCO 3 - + C 5 H 5 NH + H 2 CO 3 + C 5 H 5 N 32. Consider the following illustrations: (see book) Which beaker best illustrates what happens when the following acids are dissolved in water. a. HNO 2 b. HNO 3 c. HCl d. HF e. HC 2 H 3 O 2

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35. You may need Table 14.2 to answer the following questions. a. Which is the stronger acid, HCl or H 2 O? b. Which is the stronger acid. H 2 O or HNO 2 ? c. Which is the stronger acid, HCN or HOC 6 H 5 ? 39. Values of K w as a function of temperature are as follows: Temperature ( o C) K w 0 1.14 x 10 -15 25 1.00 x 10 -14 35 2.09 x 10 -14 40. 2.92 x 10 -14 50. 5.47 x 10 -14 a. Is the autoionization of water exothermic or endothermic? b. Calculate [H + ] and [OH - ] in a neutral solution at 50. o C. 43. Fill in the missing information in the following table. pH pOH [H + ] [OH - ] Acidic, Basic or Neutral Solution a 6.88 Solution b 8.4 x 10 -14 M Solution c 3.11 Solution d 1.0 x 10 -7 M 46. The pOH of a sample of baking soda dissolved in water is 5.74 at 25 o C. Calculate the pH, [H + ], and [OH - ] for this sample. Is the solution acidic or basic?
49. A solution is prepared by adding 50.0 mL of 0.050 M HCl to 150.0 mL of 0.10 M HNO 3 . Calculate the concentrations of all species in solution. 55. A 0.0560 g sample of acetic acid is added to enough water to make 50.00 mL of solution. Calculate [H + ], [CH 3 COO - ], [CH 3 COOH], and the pH at equilibrium. K a for acetic acid is 1.8 x 10 -5.

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a. a solution containing 0.10 M HCl and 0.10 M HOCl.
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Chapter_14_Homework_Key - Chapter 14 Homework Solutions 28...

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