Vinegar and Baking Soda Balloon Inflation

Observe a chemical reaction that produces gas and understand how gas pressure works through balloon inflation.

What you need

• 1 empty plastic bottle
• 1 balloon
• 2 tablespoons of baking soda
• 1/2 cup vinegar
• 1 funnel or paper cone
• Spoon

How it works

Mixing vinegar (acid) and baking soda (base) creates a chemical reaction that forms carbon dioxide (CO₂) gas. The gas builds up pressure and inflates the balloon. This demonstrates both chemical changes and gas expansion.