Could you build a rocket to at least a km high into the air using alka seltzer?
Could you build a rocket and launch it 1 km up using Alka Seltzer? That would depend on your ratio of water to Alka Seltzer and the properties of your rocket, as well as how you used the gas produced to launch it. If you had a small rocket, maybe 40 cm or so in length, and it was stable (pointed nose cone, tail fins, and bottom heavy for a start) you would be off to a good start. The next thing you need to do is see what kind of device to use for the fuel (in your case, Alka Seltzer.) If you have a small mixing system inside the rocket, remember it will give it a good boost as the reaction makes gas. The problem will be focusing it out the tail so that it gives your rocket good lift. You want a small hole at the end, but not too small (this is something you can play with to find what works best.) Something else to help would be a similar system on the ground that acts like a booster or catapult. You could load the Alka Seltzer into a tank, add water, and let the pressure build up until
