2. The titration of 100 mL of carbonic acid with 1.0 M NaOH is shown below. 0.10 L Carbonic a. Label the equivalence point on the graph and circle the buffering region b. Based on the given information what is the pka1 of carbonic acid? (Explain/Show your work) c. Determine the initial concentration of the carbonic acid (Show your work) E 9.0 8.0 7.0 6.0 5.0 4.0 0.0 2.5 5.0 NaOH (mL) 7.5 10.0

Chemical Principles in the Laboratory
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ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
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Chapter43: Analysis For Vitamin C
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question 2 a-d

1:38 PM Tue Aug 16
X
Chem 348
1review
PDF - 91 KB
Review of Concepts
1. To make beer and bread, yeast convert acetaldehyde to ethanol.
a. Is the acetaldehyde being oxidized or reduced?
b. How many electrons are being transferred?
2. The titration of 100 mL of carbonic acid with 1.0 M NaOH is shown below.
a. Label the equivalence point on the graph
and circle the buffering region
0.10 L Carbonic
b. Based on the given information what is the
pka1 of carbonic acid? (Explain/Show
your work)
c. Determine the initial concentration of the
carbonic acid (Show your work)
pH 10.3:
Hd
9.0
8.0
7.0
6.0
5.0
4.0
0.0
Review Questions
2.5
5.0
NaOH (mL)
7.5
d. The pka2 for carbonic acid is 10.3. What specie(s) of this acid is(are) present at:
pH 2.0:
✪ 97%
10.0
Transcribed Image Text:1:38 PM Tue Aug 16 X Chem 348 1review PDF - 91 KB Review of Concepts 1. To make beer and bread, yeast convert acetaldehyde to ethanol. a. Is the acetaldehyde being oxidized or reduced? b. How many electrons are being transferred? 2. The titration of 100 mL of carbonic acid with 1.0 M NaOH is shown below. a. Label the equivalence point on the graph and circle the buffering region 0.10 L Carbonic b. Based on the given information what is the pka1 of carbonic acid? (Explain/Show your work) c. Determine the initial concentration of the carbonic acid (Show your work) pH 10.3: Hd 9.0 8.0 7.0 6.0 5.0 4.0 0.0 Review Questions 2.5 5.0 NaOH (mL) 7.5 d. The pka2 for carbonic acid is 10.3. What specie(s) of this acid is(are) present at: pH 2.0: ✪ 97% 10.0
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