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la Accessibility Mod . 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 assumeno buffers were present. What is the pH of the gastricjuice?

la Accessibility Mod . 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 assumeno buffers were present. What is the pH of the gastricjuice?

Organic And Biological Chemistry
Organic And Biological Chemistry
7th Edition
ISBN:9781305081079
Author:STOKER, H. Stephen (howard Stephen)
Publisher:STOKER, H. Stephen (howard Stephen)
Chapter10: Enzymes And Vitamins
Section: Chapter Questions
Problem 10.80EP
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Accessibility Mode 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 builds up 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 of 0.6 mM HCI and 0.4 mM NaOH? d. What is the pH of a mixture of equal volumes of 0.6 mM Lactic acid and0.4 mM NAOH? e. If the concentrations of HCl and NaOH are tripled in part c, by what factor will the pH be changed? f. If the concentrations of lactic acid and NAOH are tripled in part d, by what factor the pH be changed? g. What is the rationale for the observed difference in pH as a function of increasing HCl and lactic acid concentrations?
Transcribed Image Text:Accessibility Mode 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 builds up 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 of 0.6 mM HCI and 0.4 mM NaOH? d. What is the pH of a mixture of equal volumes of 0.6 mM Lactic acid and0.4 mM NAOH? e. If the concentrations of HCl and NaOH are tripled in part c, by what factor will the pH be changed? f. If the concentrations of lactic acid and NAOH are tripled in part d, by what factor the pH be changed? g. What is the rationale for the observed difference in pH as a function of increasing HCl and lactic acid concentrations?
3. Calculate the % change in length of your control Planaria over time. Express your answer as a percent. [Final length- Initial length] x100 Initial length 4. If your Planaria (or sections of your Planaria) died, please speculate as to why they died. What would you do differently next time? 5. How does this experiment account for multiple trials?
Transcribed Image Text:3. Calculate the % change in length of your control Planaria over time. Express your answer as a percent. [Final length- Initial length] x100 Initial length 4. If your Planaria (or sections of your Planaria) died, please speculate as to why they died. What would you do differently next time? 5. How does this experiment account for multiple trials?
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