I gave him a baking sheet with a layer of baking soda spread on it (cover table with newspaper to start but this craft really isn't messy!) and a bowl of vinegar. We used food colouring to make it more fun, and it makes it more holiday appropriate (green for upcoming St Patty's day). We used an old medicine dropper but any little things can be used and would make it more fun. He used the medicine dropper to suck up vinegar and drop it onto the baking soda. So simple but so fun! He played with this for over an hour, I just had to refill his baking soda an vinegar once. Every time he dropped vinegar on the baking soda he yelled "whoa!". We will definitely be doing this again soon!
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