20.23 The mutarotation of glucose is first order in glucose con- centration and is catalyzed by acids (A) and bases (B). The first- order rate constant may be expressed by an equation of the type that is encountered in reactions with parallel paths: k = ko + kH• [H*]+ ka[A] + kB[B] %3D where ko is the first-order rate constant in the absence of acids and bases other than water. The following data were obtained by J. N. Brønsted and E. A. Guggenheim [J. Am. Chem. Soc. 49:2554 (1927)] at 18°C in a medium containing 0.02 mol L-1 sodium acetate and various concentrations of acetic acid: [CH3CO,H]/mol L-1 k/10¬4 min-1 0.020 0.105 0.199 1.36 1.40 1.46 Calculate ko and kA. The term involving kH+ is negligible under these conditions.

20.23 The mutarotation of glucose is first order in glucose con- centration and is catalyzed by acids (A) and bases (B). The first- order rate constant may be expressed by an equation of the type that is encountered in reactions with parallel paths: k = ko + kH• [H*]+ ka[A] + kB[B] %3D where ko is the first-order rate constant in the absence of acids and bases other than water. The following data were obtained by J. N. Brønsted and E. A. Guggenheim [J. Am. Chem. Soc. 49:2554 (1927)] at 18°C in a medium containing 0.02 mol L-1 sodium acetate and various concentrations of acetic acid: [CH3CO,H]/mol L-1 k/10¬4 min-1 0.020 0.105 0.199 1.36 1.40 1.46 Calculate ko and kA. The term involving kH+ is negligible under these conditions.

Chemistry

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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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20.23 The mutarotation of glucose is first order in glucose con-
centration and is catalyzed by acids (A) and bases (B). The first-
order rate constant may be expressed by an equation of the type
that is encountered in reactions with parallel paths:
k = ko + kH+ [H*] + ka[A] + kB[B]
%3D
where ko is the first-order rate constant in the absence of acids
and bases other than water. The following data were obtained
by J. N. Brønsted and E. A. Guggenheim [J. Am. Chem. Soc.
49:2554 (1927)] at 18°C in a medium containing 0.02 mol L-1
sodium acetate and various concentrations of acetic acid:
[CH3CO,H]/mol L-1
k/10¬4 min-1
0.020
0.105
0.199
1.36
1.40
1.46
Calculate ko and kA. The term involving kH+ is negligible under
these conditions.

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