Baking-Soda Balloon Inflation

Balloon inflates without anyone blowing. Ask students to predict what will happen. Combine reactants so produced gas fills balloon. Key idea: Acid-base reaction makes carbon dioxide gas. Ask: What new thing is filling the balloon? Safety and cleanup: Goggles; do not seal rigid container. https://www.google.com/search?q=%22Baking-Soda+Balloon+Inflation%22+science+demonstration+experiment