ANTACID: Maalox Tums Mylanta CVS Brand Rennies 20.0 g 21.0 g 18.0 g 18.3 g 17.5 g mL NaOH used in back-titration: 24.1mL 22.4mL 20.0mL 19.9mL 24.4mL 1. Which is the strongest antacid, on a single-dose basis? Which is the weakest? Explain and show your calculations. 2. Which are the strongest and weakest, on a by-weight (mass) basis? 3. When people do back titrations, they usually watch the solution for a color change when the solution becomes neutral. What might you have used in the above experiment to get this color change to happen in the solution? At what pH would the solution have been neutral? 4. If you had walked into the lab, only to discover that you only had 0.1 M sulfuric acid available to run your tests, how might this have affected your calculations? Why? 5. In most of the antacids you tested, the active ingredient is Aluminum Hydroxide. Here is an unbalanced reaction that shows how this chemical neutralizes HCl (the main ingredient in stomach acid). Please provide a balanced version of this equation: Al(OH)3 + HCI -> AlCl3 + H20