This activity can be easily extended into a quantitative experiment by titrating an
accurately weighed sample of sodium bicarbonate with acid of known concentration, by
measuring the mass of CO2 lost (weigh the baking soda and vinegar separately before the
reaction, and the mixture again after the reaction), or by measuring the volume of carbon
dioxide generated from a weighed sample of baking soda (this is probably the most difficult,
because carbon dioxide is soluble in water.)