The goal of this experiment is to determine the Calcium Carbonate content of an anti-acid pill. A secondary goal is to learn how to properly titrate a solution.
I hypothesize that by adding a known volume of HCl of a set concentration to a known mass of Calcium Carbonate, and boiling it, that, provided one properly took stoichiometric ratios into account, that one can react all of the Calcium Carbonate with HCl, and have a remaining volume of HCl in the solution. One can then titrate the solution with a standardized NaOH solution, and thus knowing the stoichiometric ratio between the NaOH and HCl, calculate how much of the HCl solution was remaining. Then, by subtracting this from the total amount of HCl solution added initially, one can determine how much HCl reacted with the Calcium Carbonate, and then by accounting for stoichiometry, how many moles of Calcium Carbonate were in the pill. Then, one can use the formula weight of Calcium Carbonate to determine how many grams of Calcium Carbonate were in the pill, or, if so desired, the percentage of the pill that is made of Calcium Carbonate.