Final answer:
Increasing the temperature of the reactants in the Antacid Film Canister Lab would cause the equilibrium position to shift to favor the reactants, resulting in an increase in their concentration and a decrease in the concentration of the products.
Step-by-step explanation:
According to Le Chatelier's principle, if the temperature of the reactants in the Antacid Film Canister Lab is increased, the equilibrium position will shift in a direction that minimizes the temperature increase. Since the reaction is exothermic, it releases heat. Increasing the temperature will shift the equilibrium to the left, favoring the reactants. As a result, the concentration of the reactants will increase and the concentration of the products will decrease.