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The reaction is endothermic so absorbs the heat whilst reacting. Therefore it ultimately shrinks back and will be colder. Get the thermometer out and add another aspect to the experiment.
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My guess:
The balloon inflates because the pressure inside is greater than outside. Then some air is lost through the balloon material itself or the seal at the neck. Then it cools down and the amount of air inside is reduced compared to when you started so you get the effect you've seen.
Constable_Savage
Cupcakes
@hugo7
Why has the balloon gone inside the bottle?
I did an experiment with my kid. We put vinegar and baking powder in a bottle and the balloon inflated. Which I expected. The balloon went down. Which I expected.
But now a vacuum has been created.
How come?
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