Chemistry
10th Edition
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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At the end of the experiment how will you determine which tablet is more
effective than the other

Transcribed Image Text:21:34
Acid indigestion is a common ailment caused by the overproduction of stomach acid,
HCI. Over-the-counter antacids provide some relief from the symptoms of acid
indigestion. They are generally made up of some mixture of weak bases such as
Mg(OH)2, Al(OH)s, and Cacos that can react with acid as shown in these net ionic
equations:
H*(aq)+OH"(aq)- H2O(1)
2H"(aq) +CO"(aq) - H2O(1)+CO:(g)
In this exercise, the method of titration will be used to determine the number of moles
of H+ neutralized per gram of antacid. In the "back-titration," a portion of antacid will
be mixed with an excess of HCI. The H* that has not reacted with the antacid is then
titrated with standardized NaOH in the presence of the indicator bromophenol blue to
a blue end point.
Total moles of H* = moles of H* neutralized by antacid + moles of H* neutralized by
NaOH
Because the antacid includes both OH and CO23, it is not possible to calculate the
number of moles of each
these ion species independently. Instead, the number of
H* neutralized by the antacid is found. The amount of antacid required to neutralize
one mole of H* neutralized is said to be one "equivalent."
total equivalent of antacid=total mole of H' neutralized
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