This demonstration is designed to illustrate the concept of limiting reagent in a spectacular way. Via a series of experiments where the amount of vinegar is fixed and the amount of NaHCO[subscript 3] is gradually increased, the volume of CO[subscript 2] generated from the reaction varies corresponding to the amount of NaHCO[subscript 3] until it reaches the point where the CO[subscript 2] volume remains constant no matter how much NaHCO[subscript 3] is used. The observation clearly leads to the conclusion that before the equivalence point, NaHCO[subscript 3] is the limiting reagent and vinegar becomes the limiting reagent afterwards. This demonstration is appropriate for introductory high school chemistry level and recommended for a large classroom presentation. (Contains 3 figures and 4 notes.)