H. 5.7 x 10 -10 1.5 x 10-11 || H 7.9 x 10-12 Br H. В (ад) + H2О(1) нв" (aq) + Он (ад) [HB"][OH [B] The table above provides the chemical structures for weak bases and their ionization constants, K,. Based on the data, which of the following provides the best reason for the trend in base strengths? The number of hydrogen atoms В The number of resonance structures The different electronegativities of H, I, and Br The different molar masses O=0 IO=U HO=0
H. 5.7 x 10 -10 1.5 x 10-11 || H 7.9 x 10-12 Br H. В (ад) + H2О(1) нв" (aq) + Он (ад) [HB"][OH [B] The table above provides the chemical structures for weak bases and their ionization constants, K,. Based on the data, which of the following provides the best reason for the trend in base strengths? The number of hydrogen atoms В The number of resonance structures The different electronegativities of H, I, and Br The different molar masses O=0 IO=U HO=0
Chemistry for Today: General, Organic, and Biochemistry
9th Edition
ISBN:9781305960060
Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Chapter9: Acids, Bases, And Salts
Section: Chapter Questions
Problem 9.84E
Related questions
Question
![H.
C.
5.7 x 10-10
-11
1.5 x 10-
H.
|
C.
7.9 х 10-12
Br
[HB*][OH
B(aq) + H20(1)2 HB†(aq) + OH (aq)
[B]
The table above provides the chemical structures for weak bases and their ionization constants, K. Based
on the data, which of the following provides the best reason for the trend in base strengths?
A
The number of hydrogen atoms
The number of resonance structures
The different electronegativities of H, I, and Br
The different molar masses
HO=U](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdb150bb4-21d7-4a79-9cf5-b28d74614c67%2F4c5b2adc-7143-4dcc-bac1-44430869874e%2F78gw2he_processed.jpeg&w=3840&q=75)
Transcribed Image Text:H.
C.
5.7 x 10-10
-11
1.5 x 10-
H.
|
C.
7.9 х 10-12
Br
[HB*][OH
B(aq) + H20(1)2 HB†(aq) + OH (aq)
[B]
The table above provides the chemical structures for weak bases and their ionization constants, K. Based
on the data, which of the following provides the best reason for the trend in base strengths?
A
The number of hydrogen atoms
The number of resonance structures
The different electronegativities of H, I, and Br
The different molar masses
HO=U
![Question 14 a
The equilibrium for the reaction between (CH,),NH, a weak base, and water is represented by the
equation below. The table shows the pH of three solutions of (CH,),NH(aq) at 25°C.
(CH3),NH(aq) + H2O(1) 2 (CH,),NH,*(aq) + OH¯(aq)
5.4 x 10-4 at 25°C
Kb
[(CH3),NH]
pH at 25°C
0.050
11.69
Submit
0.10
11.85
0.20
12.01
A student mixes 100. mL of 0.200 M (CH3),NH(aq) with 100. mL of 0.200 M (CH3),NH2C1(aq)
and claims that if a small amount of strong base is added to the mixture, then the resulting change in pH of
the mixture will be smaller than the change in pH that would result from adding the same amount of strong
base to 200. mL of 0.200 M (CH3),NH(aq). Which of the following best explains whether or not the
student's claim is correct?
The claim is correct because the mixture contains only half of the (CH3),NH(aq) that
the 0.200 M (CH3),NH(aq) contains. The lesser amount of base in the mixture makes
the pH of the mixture lower than the pH of the 0.200 M (CH3),NH(aq); therefore,
when a small amount of strong base is added, the change in the pH of the mixture will be
smaller than the change in the pH of the 0.200 M (CH3),NH(aq).
A
The claim is correct because the mixture contains a significant amount of the acid
(CH3),NH2"(aq), which can react with and partially neutralize the added strong base,
thereby reducing the change in pH. In 0.200 M (CH3),NH(aq), the concentration of
the acid (CH3),NH,™(aq) is very small; therefore, the added strong base is not
neutralized and the change in pH will be larger.
В
+
The claim is incorrect because the mixture contains only half of the (CH3),NH(aq) that
the 0.200 M (CH3),NH(aq) contains. The lesser amount of base in the mixture makes
the pH of the mixture lower than the pH of the 0.200 M (CH3),NH(aq); therefore,
when a small amount of strong base is added, the change in the pH of the mixture will be
larger than the change in the pH of the 0.200 M (CH3),NH(aq).
The claim is incorrect because the change in pH resulting from the addition of a small
amount of strong base to the mixture and to the 0.200 M (CH3),NH(aq) will be the
same given that the same amount of strong base is being added to the same volume of
solution.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdb150bb4-21d7-4a79-9cf5-b28d74614c67%2F4c5b2adc-7143-4dcc-bac1-44430869874e%2Fgua99to_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Question 14 a
The equilibrium for the reaction between (CH,),NH, a weak base, and water is represented by the
equation below. The table shows the pH of three solutions of (CH,),NH(aq) at 25°C.
(CH3),NH(aq) + H2O(1) 2 (CH,),NH,*(aq) + OH¯(aq)
5.4 x 10-4 at 25°C
Kb
[(CH3),NH]
pH at 25°C
0.050
11.69
Submit
0.10
11.85
0.20
12.01
A student mixes 100. mL of 0.200 M (CH3),NH(aq) with 100. mL of 0.200 M (CH3),NH2C1(aq)
and claims that if a small amount of strong base is added to the mixture, then the resulting change in pH of
the mixture will be smaller than the change in pH that would result from adding the same amount of strong
base to 200. mL of 0.200 M (CH3),NH(aq). Which of the following best explains whether or not the
student's claim is correct?
The claim is correct because the mixture contains only half of the (CH3),NH(aq) that
the 0.200 M (CH3),NH(aq) contains. The lesser amount of base in the mixture makes
the pH of the mixture lower than the pH of the 0.200 M (CH3),NH(aq); therefore,
when a small amount of strong base is added, the change in the pH of the mixture will be
smaller than the change in the pH of the 0.200 M (CH3),NH(aq).
A
The claim is correct because the mixture contains a significant amount of the acid
(CH3),NH2"(aq), which can react with and partially neutralize the added strong base,
thereby reducing the change in pH. In 0.200 M (CH3),NH(aq), the concentration of
the acid (CH3),NH,™(aq) is very small; therefore, the added strong base is not
neutralized and the change in pH will be larger.
В
+
The claim is incorrect because the mixture contains only half of the (CH3),NH(aq) that
the 0.200 M (CH3),NH(aq) contains. The lesser amount of base in the mixture makes
the pH of the mixture lower than the pH of the 0.200 M (CH3),NH(aq); therefore,
when a small amount of strong base is added, the change in the pH of the mixture will be
larger than the change in the pH of the 0.200 M (CH3),NH(aq).
The claim is incorrect because the change in pH resulting from the addition of a small
amount of strong base to the mixture and to the 0.200 M (CH3),NH(aq) will be the
same given that the same amount of strong base is being added to the same volume of
solution.
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