Vinegar and Baking Soda

Close observation of these substances, and their interaction, can lead to a great discussion of a myriad of science concepts. At the start, differences in texture (feel), color, and smell of the two reactants can be noted. Identifying each substance as a solid, liquid, or gas can also be helpful as students process the similarities and differences of each state of matter. After pouring the baking soda into the vinegar, observations and discussions with respect to mixing, dissolving, and reacting should ensue.

As the baking soda and vinegar combine, the system is propelled into a fast moving and quickly changing arena. As students observe the gas bubbles, they may infer this as a sign of a chemical reaction. In this case, two chemical reactions between the baking soda and vinegar causes the production of carbon dioxide gas and sodium citrate (new substances). The less dense carbon dioxide gas quickly expands to blow up the balloon and film canister.