• Question: Some one told me that there`s a chemical reaction when baking soda explodes when it comes into contact with vinegar. Is it true, and what else on the subject?

    Asked by niamh to Áine, Ciarán, Eoin, Lydia, Victoria on 10 Nov 2014.
    • Photo: Ciarán O'Brien

      Ciarán O'Brien answered on 10 Nov 2014:


      Oh, I can confirm that’s true, I used to have fun making small bombs from a lemonade bottle and my mother’s baking ingredients!

      My chemistry is a bit rusty, but as far as I remember, the scientific name for baking soda is sodium bicarbonate, and vinegar is fairly dilute acetic acid.

      when you mix sodium bicarbonate with acid, they react to form carbon dioxide (the gas you breathe out) and water (and sodium acetate, a kind of salt, which will dissolve in the water giving it a funny taste). If you just mix the two in a glass it’ll fizz up but won’t explode. Well, it will, but it’ll explode so slowly there’s no bang. But if you put the two in a plastic bottle and seal it up, the carbon dioxide will keep building up and eventually the bottle will explode, sending foamy mess everywhere, and making your parents VERY angry.

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