15.57. The K, of aminoethanol, HOCH₂CH₂NH₂, is 3.1 x 10-5. a. Is aminoethanol a stronger or weaker base than ethylamine, pK, = 3.36? b. Calculate the pH of a 1.67 X 102 M solution of aminoethanol.

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ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Steven S. Zumdahl
Chapter14: Acids And Bases
Section: Chapter Questions
Problem 10RQ: For oxyacids, how does acid strength depend on a. the strength of the bond to the acidic hydrogen...
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I need help with 15:57 please I’m stuck in that part
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Questions and Problems 781
c. Calculate the [OH-] concentration of a 4.25 ×10-4 M
solution of aminoethanol.
15.58. Food Dye Quinoline is a weakly basic liquid used in the
manufacture of quinolone yellow, a greenish-yellow dye for
foods, and in the production of niacin. Its pK, is 9.15.
a. What is the pH of a 0.0752 M solution of quinolone?
b. What is the hydroxide ion concentration of the solution
in part (a)?
15.59. Painkillers Morphine is an effective painkiller but is
also highly addictive. Codeine is a popular prescription
painkiller because it is much less addictive than morphine.
Codeine contains a basic nitrogen atom that can be
protonated to give the conjugate acid of codeine.
a. Calculate the pH of a 1.8 x 10-3 M solution of
morphine if its pK, = 5.79.
b. Calculate the pH of a 2.7 X 10 M solution of codeine
if the pK, of the conjugate acid is 8.21.
15.60. The awful odor of dead fish is due mostly to
trimethylamine, (CH3)3N, one of three compounds related
to ammonia in which methyl groups replace 1, 2, or all 3 of
the H atoms in ammonia.
a. The K of trimethylamine [(CH3)3N] is 6.5 x 10-5 at
25°C. Calculate the pH of a 3.00 x 10-4 M solution of
trimethylamine.
b. The K, of methylamine [(CH3)NH₂] is 4.4 X 10 at
25°C. Calculate the pH of a 2.88 X 10-³ M solution of
methylamine.
*c. The K, of dimethylamine [(CH3)2NH] is 5.9 X 10 at
25°C. What concentration of dimethylamine is needed
for the solution to have the same pH as the solution in
part (b)?
Polyprotic Acids
Concept Review
15.61. Why is the K, value of phosphoric acid less than its K₁,
value but greater than its K, value?
15.62. In calculating the pH of a 1.0 M solution of H₂SO3, we
can ignore the H* ions produced by the ionization of the
bisulfate (HSO3) ion; however, in calculating the pH of
a 1.0 M solution of sulfuric acid, we cannot ignore the H*
ions produced by the ionization of the bisulfate ion. Why?
15.63. Carbonic acid, H₂CO3, is a very weak diprotic acid
(K,= 4.3 x 10-7), but germanic acid, H₂GeO3, is even
weaker (K,,= 9.8 x 10-10). Suggest a reason why.
15.64. Figure P15.64 contains skeletal structures of two
782
CHAPTER
15.67. Ascorbic acid
the pH of a 0.
15.68. Rhubarb Pie T
concentrations
and must be re
rhubarb pie. W
oxalic acid?
15.69. Nicotine Addict
properties of to
solution of nice
15.70. Pseudoephedri
common ingree
pK, 9.22. W
in pseudoephed
H
OF
FIGURE P15.70
15.71. Malaria Treatme-
the cinchona tre
for malaria. Cal
quinine in water
15.72. Dozens of pharm
sickness to Viag
organic compour
Figure P15.72.
a. Solutions of p
Kb = 2.15 X
solution of pip
*b. Draw the stru
would be pres
NH
NH
FIGURE P15.7
Acid Strength and
Concept Review
15.73. Explain why the K
CLEO
Transcribed Image Text:e: water or 10-11 in an x 10-8 in d? strengths nd ter, the bound is the -, dissolves he formula Hrochloric e. lactic acid s solution, me of its K? in part to breakdown Ed is 1.23% acid. M solution ine the ially ntrations ore resent as a 50% les of HNO3 lue of HNO₂? s formic culate the can shrub ecause on of K, of the acid? n the erage pH of Questions and Problems 781 c. Calculate the [OH-] concentration of a 4.25 ×10-4 M solution of aminoethanol. 15.58. Food Dye Quinoline is a weakly basic liquid used in the manufacture of quinolone yellow, a greenish-yellow dye for foods, and in the production of niacin. Its pK, is 9.15. a. What is the pH of a 0.0752 M solution of quinolone? b. What is the hydroxide ion concentration of the solution in part (a)? 15.59. Painkillers Morphine is an effective painkiller but is also highly addictive. Codeine is a popular prescription painkiller because it is much less addictive than morphine. Codeine contains a basic nitrogen atom that can be protonated to give the conjugate acid of codeine. a. Calculate the pH of a 1.8 x 10-3 M solution of morphine if its pK, = 5.79. b. Calculate the pH of a 2.7 X 10 M solution of codeine if the pK, of the conjugate acid is 8.21. 15.60. The awful odor of dead fish is due mostly to trimethylamine, (CH3)3N, one of three compounds related to ammonia in which methyl groups replace 1, 2, or all 3 of the H atoms in ammonia. a. The K of trimethylamine [(CH3)3N] is 6.5 x 10-5 at 25°C. Calculate the pH of a 3.00 x 10-4 M solution of trimethylamine. b. The K, of methylamine [(CH3)NH₂] is 4.4 X 10 at 25°C. Calculate the pH of a 2.88 X 10-³ M solution of methylamine. *c. The K, of dimethylamine [(CH3)2NH] is 5.9 X 10 at 25°C. What concentration of dimethylamine is needed for the solution to have the same pH as the solution in part (b)? Polyprotic Acids Concept Review 15.61. Why is the K, value of phosphoric acid less than its K₁, value but greater than its K, value? 15.62. In calculating the pH of a 1.0 M solution of H₂SO3, we can ignore the H* ions produced by the ionization of the bisulfate (HSO3) ion; however, in calculating the pH of a 1.0 M solution of sulfuric acid, we cannot ignore the H* ions produced by the ionization of the bisulfate ion. Why? 15.63. Carbonic acid, H₂CO3, is a very weak diprotic acid (K,= 4.3 x 10-7), but germanic acid, H₂GeO3, is even weaker (K,,= 9.8 x 10-10). Suggest a reason why. 15.64. Figure P15.64 contains skeletal structures of two 782 CHAPTER 15.67. Ascorbic acid the pH of a 0. 15.68. Rhubarb Pie T concentrations and must be re rhubarb pie. W oxalic acid? 15.69. Nicotine Addict properties of to solution of nice 15.70. Pseudoephedri common ingree pK, 9.22. W in pseudoephed H OF FIGURE P15.70 15.71. Malaria Treatme- the cinchona tre for malaria. Cal quinine in water 15.72. Dozens of pharm sickness to Viag organic compour Figure P15.72. a. Solutions of p Kb = 2.15 X solution of pip *b. Draw the stru would be pres NH NH FIGURE P15.7 Acid Strength and Concept Review 15.73. Explain why the K CLEO
esc
fluoroacetic acid has a pH of 1.44, what is the K, of the acid?
15.55. Acid Rain I A weather system moving through the
American Midwest produced rain with an average pH of
5.02. By the time the system reached New England, the
rain it produced had an average pH of 4.66. How much
more acidic was the rain falling in New England?
15.56. Acid Rain II A newspaper reported that the "level of
acidity" in a sample taken from an extensively studied
watershed in New Hampshire in 1998 was "an astounding
200 times lower than the worst measurement" taken in the
preceding 23 years. What is this difference expressed in
units of pH?
15.57. The K, of aminoethanol, HOCH₂CH₂NH2, is 3.1 X 10.
a. Is aminoethanol a stronger or weaker base than
ethylamine, pK, = 3.36?
b. Calculate the pH of a 1.67 x 10-² M solution of
aminoethanol.
!
1
@ 2
#3
15.63.
15.64.
G
a
10
se
HO
FIGU
Problems
15.65. What
15.66. What
Transcribed Image Text:esc fluoroacetic acid has a pH of 1.44, what is the K, of the acid? 15.55. Acid Rain I A weather system moving through the American Midwest produced rain with an average pH of 5.02. By the time the system reached New England, the rain it produced had an average pH of 4.66. How much more acidic was the rain falling in New England? 15.56. Acid Rain II A newspaper reported that the "level of acidity" in a sample taken from an extensively studied watershed in New Hampshire in 1998 was "an astounding 200 times lower than the worst measurement" taken in the preceding 23 years. What is this difference expressed in units of pH? 15.57. The K, of aminoethanol, HOCH₂CH₂NH2, is 3.1 X 10. a. Is aminoethanol a stronger or weaker base than ethylamine, pK, = 3.36? b. Calculate the pH of a 1.67 x 10-² M solution of aminoethanol. ! 1 @ 2 #3 15.63. 15.64. G a 10 se HO FIGU Problems 15.65. What 15.66. What
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