DRAFT: This module has unpublished changes.

The purpose of this experiment is to determine the CaCO3 content of an anti-acid pill and compare the nominal value of a generic. An anti-acid pill contains CaCO3, which is the what reacts with the stomach acid and removes an excess amount. Typically the anti-acid pill does as it is intended and lowers heart burn and indigestion without harm to the physiology of the body. The decomposition reaction occurs as follows:

 

CaCO3(s)+2H3O+(aq)⟶ Ca2+(aq)+CO2(g)+3H2O(l)

 

As we know CACO3 is not water soluble, therefore it cannot be titrated directly. In this case we must perform a reverse titration where we react CACO3 with an HCl solution of known concentration. The CaCO3 will then remove some of the HCl and then we will be able to determine the CaCO3 content by analyzing the amount of HCl that was not consumed in the reaction. 

DRAFT: This module has unpublished changes.