Experiment 13 Analysis of Antacid Tablets

In this experiment the neutralizing power of various antacids will be determined. Antacids contain basic compounds that will neutralize stomach acid (stomach acid is HC1). The amount of base in the antacid tablets will be determined by an acid-base titration. It is a back titration method. This method is used because most antacids produce carbon dioxide gas, which can interfere with the titration. By initially adding an excess of acid, one can drive off the C02 by boiling the solution before titrating the excess acid. There are many brands of commercial antacids with various ingredients. A few of the common ones are listed below  

This experiment was provided by Susan Marine of Miami University Middletown, Middletown, Ohio. 

These bases react with acid as shown below  

Prepare a solution of HC1 that is approximately 0.2 M and standardize it. Prepare a solution of NaOH that is between 0.10 and 0.15 M and standardize it. 

Record the name of the antacid you are testing. Describe the bottle include price, net weight, number of tablets, active ingredients, and other information from the label. 

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