Did you know Alka-Seltzer has science experiments? Have you made Alka-Seltzer rockets? Let your kids experiment with quarter, half, or whole tablets. Does it matter if the film canister lid is up or down? Does the water temperature change the results? (Amazon and Educational Innovations and Home Science Tools sell film canisters.) Here is a lab with citric acid and baking soda. Experiment by substituting vinegar for citric acid.
Here is a scientific method lab with fizzy tablets. (BTW any effervescent tablet works. The tablet contains citric acid and baking soda.). Here is a Stoichiometry lab for Chemistry with fizzy tablets. Just for fun, make DIY lava lamps. You can achieve good lab results without breaking the bank.
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