Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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How would you solve c?
![3
3. Formic acid, HCOOH (K₂ = 1.77 x 104) is naturally found in the venom of bee stings, and is used
synthetically as a preservative in livestock feed.
a. Write the K, expression for formic acid.
Kax K₁=1.0 x· 10-14
077x10-4 x K₁=1.0×10-14 [CO] [OH-]
Kb = 5.6×10-11
ко
[HCOOHIL
[0.00660][0.00665]
[0.243] 1.82x10²4
-1.78×10-4
1682x10-4-97.25
100-9720-2.75%
"X100 -
(0) HC (69)
b. Calculate the pH of a 0.25 M solution of formic acid.
1.77x10-4 = (0,25M) [H
[H+]=7.08×10-4
PH=-10g (7.08x10-41) |
PH=3.15
c. What is the % dissociation of the formic acid?
HCOOH
0.25M
-X
0.25-x
HCO + + OH
XX
ka=
ta
z
DOLLS
.25
0
(aq) 0.25
025-1-77x10-4
x²=4.425x10-5
x=0.00665 [H-0005
X [HCCOHT=0.243 LHCO1=0.00665
px x
X₁²](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5a487c5b-631b-4d04-995d-e7c019732a55%2F811bb94b-7bc4-410f-a446-36545b347e8d%2F3mrzrgo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3
3. Formic acid, HCOOH (K₂ = 1.77 x 104) is naturally found in the venom of bee stings, and is used
synthetically as a preservative in livestock feed.
a. Write the K, expression for formic acid.
Kax K₁=1.0 x· 10-14
077x10-4 x K₁=1.0×10-14 [CO] [OH-]
Kb = 5.6×10-11
ко
[HCOOHIL
[0.00660][0.00665]
[0.243] 1.82x10²4
-1.78×10-4
1682x10-4-97.25
100-9720-2.75%
"X100 -
(0) HC (69)
b. Calculate the pH of a 0.25 M solution of formic acid.
1.77x10-4 = (0,25M) [H
[H+]=7.08×10-4
PH=-10g (7.08x10-41) |
PH=3.15
c. What is the % dissociation of the formic acid?
HCOOH
0.25M
-X
0.25-x
HCO + + OH
XX
ka=
ta
z
DOLLS
.25
0
(aq) 0.25
025-1-77x10-4
x²=4.425x10-5
x=0.00665 [H-0005
X [HCCOHT=0.243 LHCO1=0.00665
px x
X₁²
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