Blow Up a Balloon with Lemon Juice

We have had lots of fun with this one today, although it’s taken several attempts to perfect our technique.

What you need:

A small bottle or jar
Lemon juice
Bicarbonate of soda


Stretch the balloon a bit first so it will be easy to inflate.

Quarter fill the bottle or jar with lemon juice.

Use a funnel to tip the bicarbonate of soda  ( baking soda ) into the balloon.

Blow up a balloon with lemon juice

Place the ballon over the top of the bottle. When you’re ready tip the balloon up so the baking soda drops into the lemon juice.

Blow up a balloon with lemon juice

Watch the balloon inflate.

Blow up a balloon with lemon juice

Extension Task

Can you set up a fair experiment to investigate whether vinegar or lemon juice produce the most gas? How can you tell?

Think about which conditions you need to keep the same…( amount of baking soda and amount of vinegar and lemon juice )

The Science bit

The balloon should inflate because adding the lemon juice/vinegar to the bicarbonate of soda creates a chemical reaction, when the two combine they create the gas carbon dioxide. The gas rises up and through the water bottle into the balloon blowing it up.

This is an example of a reaction between an acid ( lemon juice/vinegar ) and a base.

More Baking Soda Ideas

10 brilliant baking soda experiments

How to blow up a balloon with lemon juice

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