Recently I saw this activity at Teach Preschool. When I saw this I knew it was something Hasan would love to do. It's very simple and uses household items. I used apple cider vinegar but I would recommend using white vinegar. Apple cider vinegar is pretty stinky. Hasan loved this activity and it kept him occupied for awhile. Near the end he was complaining that his eyes were burning. I waited for Bilal to go down for his nap so Hasan could play undisturbed.
In some small bowls, add vinegar and a couple of drops of food colour. Use as many bowls as you like. In another bowl add baking soda and keep a spoon in it. Place all these items on a rimmed tray. Have your child put some baking soda on the tray using the spoon. I also had another bowl for Hasan to put the eye dropper when he was spooning out the baking soda. Then using the eye dropper have them drop the coloured vinegar onto the baking soda so make some mini volcanoes.
When your done, pour all the vinegar in one cup. Then add in all the baking soda and make one big volcano!