
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Please answer 19 and 20
![Question 18
Calculate the [H*] in a 0.064 M solution of HCN, K, = 6.2 x 10-10.
8
a) 1.0 x 10-7 M
b) 6.3 x 10-6 M
c) 4.0 x 10-1 M
d) 1.3 x 10-5 M
e) none of these
Question 19
In a solution prepared by dissolving 0.100 mole of propanoic acid in enough
water to make 1.00 L of solution, the pH is observed to be 2.945. The K, for
propanoic acid (HC;H;O2) is
a) 1.14 x 10-3
b) 1.30 x 10-5
c) 1.15 x 10-2
d) 7.67 x 10-10
e) none of these
Question 20
Calculate the percentage of pyridine (C5HŞN) that forms pyridinium ion, CsH&N*, in
a 0.89 M aqueous solution of pyridine (Kp = 1.7 x 10-9).
a) 1.7 x 10-7%
b) 3.9 x 10-3%
c) 1.9 x 10-7%
d) 4.9 x 10-3%](https://content.bartleby.com/qna-images/question/80beb3c7-0805-4123-826a-93aa0f72cc1c/ccb0da59-0451-44e3-bd66-2d94b14f91b3/7tsbd1d_thumbnail.jpeg)
Transcribed Image Text:Question 18
Calculate the [H*] in a 0.064 M solution of HCN, K, = 6.2 x 10-10.
8
a) 1.0 x 10-7 M
b) 6.3 x 10-6 M
c) 4.0 x 10-1 M
d) 1.3 x 10-5 M
e) none of these
Question 19
In a solution prepared by dissolving 0.100 mole of propanoic acid in enough
water to make 1.00 L of solution, the pH is observed to be 2.945. The K, for
propanoic acid (HC;H;O2) is
a) 1.14 x 10-3
b) 1.30 x 10-5
c) 1.15 x 10-2
d) 7.67 x 10-10
e) none of these
Question 20
Calculate the percentage of pyridine (C5HŞN) that forms pyridinium ion, CsH&N*, in
a 0.89 M aqueous solution of pyridine (Kp = 1.7 x 10-9).
a) 1.7 x 10-7%
b) 3.9 x 10-3%
c) 1.9 x 10-7%
d) 4.9 x 10-3%
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