Alka-Seltzer Tablet

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Safety: Be careful not to lean over the rocket. Eye protection should be worn during this experiment
How do I start? Add approximately 1cm of water (between 1/4 and 1/3 full). Quickly place half of an Alka-Seltzer tablet in the film canister and fit the lid on the canister, making sure the seal is tight. Turn the canister upside-down on a flat surface. Stand back!
How does it work? When an Alka-Seltzer tablet is dropped in water, the solid citric acid and baking soda (sodium bicarbonate) inside the tablet dissolve allowing them to mix and react. The result is a chemical reaction that produces bubbles of carbon dioxide (CO2) gas. The canister lid traps this gas inside the canister. As more gas is given off, the pressure inside the canister rises
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