Fill the glass labeled cold with cold water and the one labeled hot with hot water from the faucet. Drop one AlkaSeltzer tablet in each glass and observe. Explanation AlkaSeltzer tablets contain aspirin, sodium bicarbonate, and citric acid. When the tablet is dropped into water, a chemical reaction starts and carbon dioxide is formed. It's the same bubbles that are in a can of a carbonated drink.
Molecules move faster when they are warm.
The chemical reaction happens faster in the hot water, so the bubbles will form faster in the hot water glass. The tablet in the hot water will dissolve first. All rights reserved. Used under License.