Hopsa
Baking soda (a base) and vinegar (an acid) react and make carbon dioxide – that’s the bubbles. Building a volcano around the reaction turns chemistry into an adventure, and your child discovers for themselves that the amounts change the size of the eruption.
The steps are in the app
Step-by-step instructions, tips and an easier and a harder version are waiting in the Hopsa app – along with 300 more ideas matched to your kids’ ages.
Coming soon to the App Store and Google Play
