The specific conductivity of a 0.25 M solution of a weak organic acid HA was measured at KHA = 69.7 mS m¹. Additionally, various solutions of its sodium salt have been measured at the following values. CNaA / M KNAA/MS m-1 0.00219 17.98 0.00418 33.97 0.00787 62.74 0.01427 111.13 0.02597 196.44 a. Calculate the molar conductivity at infinite dilution of the sodium salt Aºm, NaA and of the acid Am, HA using the following values. Ʌm, NaCl = 126.3 S cm² mol-1 Ʌºm, HCI = 426.2 S cm² mol-1 b. Determine the degree of dissociation of the acid αHA. c. Calculate the pKA value of HA and guess the corresponding acid.
The specific conductivity of a 0.25 M solution of a weak organic acid HA was measured at KHA = 69.7 mS m¹. Additionally, various solutions of its sodium salt have been measured at the following values. CNaA / M KNAA/MS m-1 0.00219 17.98 0.00418 33.97 0.00787 62.74 0.01427 111.13 0.02597 196.44 a. Calculate the molar conductivity at infinite dilution of the sodium salt Aºm, NaA and of the acid Am, HA using the following values. Ʌm, NaCl = 126.3 S cm² mol-1 Ʌºm, HCI = 426.2 S cm² mol-1 b. Determine the degree of dissociation of the acid αHA. c. Calculate the pKA value of HA and guess the corresponding acid.
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter20: Molecular Spectroscopy And Photochemistry
Section: Chapter Questions
Problem 67CP
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Transcribed Image Text:The specific conductivity of a 0.25 M solution of a weak organic acid HA was measured
at KHA = 69.7 mS m¹. Additionally, various solutions of its sodium salt have been
measured at the following values.
CNaA / M
KNAA/MS m-1
0.00219
17.98
0.00418
33.97
0.00787
62.74
0.01427
111.13
0.02597
196.44
a. Calculate the molar conductivity at infinite dilution of the sodium salt Aºm, NaA and of
the acid Am, HA using the following values.
Ʌm, NaCl = 126.3 S cm² mol-1
Ʌºm, HCI = 426.2 S cm² mol-1
b. Determine the degree of dissociation of the acid αHA.
c. Calculate the pKA value of HA and guess the corresponding acid.
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