acid Vitamin C is oxidized slowly to dehydroascorbic acid by the oxygen in air. It is catalyzed by ions such as Cu*? and Fe*. The reaction can be followed by measuring the ultraviolet absorbance at 243 nm.
acid Vitamin C is oxidized slowly to dehydroascorbic acid by the oxygen in air. It is catalyzed by ions such as Cu*? and Fe*. The reaction can be followed by measuring the ultraviolet absorbance at 243 nm.
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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Transcribed Image Text:но
HO
Но
HO
co + ½ 0, -
+ H,O
H"
H
но
Он
ascorbic acid
dehydroascorbic acid
Vitamin C is oxidized slowly to dehydroascorbic acid by the oxygen in air. It is catalyzed by ions such as
Cu*2 and Fe*3. The reaction can be followed by measuring the ultraviolet absorbance at 243 nm.
Time (hours)
Absorbance (A)
1/A
In A
- In A
0.75
1.3
-0.29
0.29
1
0.38
2.6
-0.97
0.97
0.19
5.3
- 1.7
1.7
3
0.095
11
- 2.4
2.4
27. Which of the following is the best interpretation of the data given above?
(A) The data support a zero-order reaction.
(B) The data support a first-order reaction.
(C) The data support a second-order reaction.
(D) The overall order is third.
28. A new compound is synthesized and found to be a monoprotic acid with a molar mass of 248
g/mole. When 0.0050 moles of this acid are dissolved in 0.500L of water, the pH is measured as 2.94.
What is the pk, of this acid?
(A)
(В)
(C)
(D)
2.33
3.89
5.78
7.78
29. What is the hybridization of carbon 1 (far left) and carbon 2 (middle) in this hydrocarbon:
CH3CH=CH2?
(A) sp, sp
(B) sp?, sp?
(C) sp3, sp2
(D) sp, sp?
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