WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 2, Problem 8SA
Summary Introduction
To describe:
The advantages of stomach pH and one potential problem associated with it.
Introduction:
pH refers to the measurement of the basicity or acidity of aqueous or other liquid solutions in terms of numbers. The conversion of the hydrogen ion concentration's values, which typically range between 0 and 14 and between 1 and 1014 gram-equivalents per liters.
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In a hospital laboratory, a 10.0 mL sample of gastric juice, obtained several hours after a meal, was titrated with 0.01 M NaOH to neutral pH of 7.0; 72.0 mL of NaOH was required for this titration. The patient’s stomach contained no ingested food or drink, thus assume that no buffers were present.
What was the pH of the 10.0 mL gastric juice sample before titrating with NaOH?
Which statement below is false about the probability of the absorption of a weak base from the
following data? pka 4.5, stomach pH 2.5, small intestine pH 7.5.
O the substance will be mostly ionized in stomach
O the substance will be mostly non-ionized in the intestine
the substance can be absorbed both in stomach and small intestine
O the ratio of ionized and non-ionized substance will not favor absorption in stomach
the ratio of ionized and non-ionized substance will favor absorption in intestine
Chemical X is a contaminant present in low quantities in drinking water. Its molecular size is about 80
nm and it may bind briefly with plasma albumin. Chemical X is a weak base with a pka of 5. Assuming
the pH of the stomach is 1, the pH of the blood is 8, and the pH of the small intestine is 8.5, describe
the absorption, distribution, biotransformation and excretion of Chemical X in a human.
Chapter 2 Solutions
WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
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