29.3.12 - Balloon science experiment

The boys have been pestering me to do a baking soda vinegar balloon science experiment, which I have postponed for several days. They learnt it by watching a science show on CBeebies channel.

Items required:
1. Baking soda
2. Vinegar
3. Plastic bottle
4. Balloon
5. Funnel

All our measurements were estimations only.

Pour some vinegar into the bottle 

Pour 2 - 3 spoonfuls of baking soda into the balloon

Place the balloon onto the mouth of the bottle, and  hold up balloon so that the baking soda falls down into the vinegar below. This creates gas.  

The solution starts bubbling and creates gas which inflates the balloon.

We tried several times to inflate the balloon bigger. However, we couldn't get the balloon to inflate much. The above picture is the largest balloon that we inflated (which was rather small).