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How to blow up a balloon with baking soda and vinegar
Pour a little vinegar into a plastic bottle.
Choose a plastic water bottle, or another bottle with a narrow neck. Pour 1-2 inches (2.5-5 cm) of vinegar into the bottle, using a funnel if you have one.
Use white vinegar, also called distilled vinegar, for the best result. You can try this with any kind of vinegar, but the inflation might take longer or require more vinegar to work.