Finding Amount of CO2 Help Please I am having trouble with my Alka-Seltzer, Water lab. The purpose of the lab is to figure out how much CO2 is produced when an amount of Alka-Seltzer is mixed with an amount of water. The only equation we have is: Alka-Seltzer + H2O ---> CO2 + Products I have tried every thing I could think of. I measured out 30mL of water, and 1g of Alka-Seltzer. The water was 28°C and the current atm of where I live = .832 atm The Experiment: I filled a bucket with water (same temperature), placed a plastic bag (with the Alka-Seltzer in it) over the graduated cylinder full of water. I immediately placed the system (air tight cylinder with water and Alka-Seltzer mixing) under water so that the liquid products stayed about the same height as the water in the bucket. When I looked at the amount of liquid product left, it stayed at 30 mL (still with gas in the container). At this point, I am not sure where to go as I do not have a balanced equation (or the reactants in Alka-Seltzer) that I could solve using Stoichiometry. I have completed a similar task where I filled a plastic bag with approximately 10 mL of water and dropped .5g of Alka-Seltzer in and sealed the bag. I lost 1 mL of water, when poured back into the graduated cylinder, but I assume that was the remaining liquid on the walls of the baggie. I would appreciate some advice as to how I can use my current data to finish the lab (Am I forgetting to do something?) or if there are any other experiments I could try / use to figure out the amount of CO2 produced. Thanks for the help.