1. a. In a hospital laboratory, a 10.0 mL sample of gastricjuice obtained several hours after a meal was titrated with 0.1 M NAOH to neutrality; 7.2 mL of NaOH was required. The patient's stomach contained no indigested food or drinks, thus assume no buffers were present. What is the pH of the gastricjuice? b. Lactic acid is produced and buildsup in muscles during intense exercise and causes painful, sore muscles. Whatis the pH of 0.6 mM lactic acid, pKa=3.86? 1 c. What is the pH of a mixture of equal volumes of0.6 mM HCI and 0.4 mM NaOH?
1. a. In a hospital laboratory, a 10.0 mL sample of gastricjuice obtained several hours after a meal was titrated with 0.1 M NAOH to neutrality; 7.2 mL of NaOH was required. The patient's stomach contained no indigested food or drinks, thus assume no buffers were present. What is the pH of the gastricjuice? b. Lactic acid is produced and buildsup in muscles during intense exercise and causes painful, sore muscles. Whatis the pH of 0.6 mM lactic acid, pKa=3.86? 1 c. What is the pH of a mixture of equal volumes of0.6 mM HCI and 0.4 mM NaOH?
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
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 99AP
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Transcribed Image Text:1. a. In a hospital laboratory, a 10.0 mL sample of gastricjuice obtained several hours
after a meal was titrated with 0.1 M NAOH to neutrality; 7.2 mL of NaOH was
required. The patient's stomach contained no indigested food or drinks, thus
assume no buffers were present. What is the pH of the gastricjuice?
b. Lactic acid is produced and buildsup in muscles during intense exercise and
causes painful, sore muscles. What is the pH of 0.6 mM lactic acid, pKa=3.86?
1
c. What is the pH of a mixture of equal volumes of0.6 mM HCl and 0.4 mM
NaOH?
d. What is the pH of a mixture of equal volumes of 0.6 mM Lactic acid and 0.4
mM NaOH?
e. If the concentrations ofHCl and NaOH are tripled in part e, by what factor will
the pH be changed?
f. If the concentrations oflactic acid and NaOH are tripled in part d. by what factor
the pH be changed?
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