What happens to Alka-Seltzer when you put it in cold water?

When you put Alka-Seltzer in cold water, it begins to dissolve and react with the water, producing carbon dioxide gas. This reaction creates bubbles and fizzing as the gas escapes. The process occurs more slowly in cold water compared to warm water, resulting in a longer time for the tablet to fully dissolve. Overall, the reaction is still effective, but the visible fizzing is less vigorous than in warm water.