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    Home » Science Experiments for Kids » Chemistry » Fizzing Rocks Valentine Style

    Fizzing Rocks Valentine Style

    February 5, 2013 By Emma Vanstone 17 Comments

    What do you think these rocks are made from? They are just bicarbonate of soda ( Baking Soda ), water and food colouring.

    bicarbonate of soda

      We’ve made fizzing rocks before, they are very simple, but great fun to watch. I used a heart cookie cutter to get the shape.

    What you need:

    Water

    Bicarbonate of soda/baking soda

    Vinegar

    Food colouring

    Instructions

    Mix some water with the bicarbonate of soda, I used a whole packet of bicarbonate of soda and just added water slowly until i had a very thick paste type mixture. Add a few drops of food colouring, mould into rock shapes and leave to dry for a few hours. Once the rocks have hardened, add vinegar very slowly and watch as they fizz and dissolve.

    Once again, thanks to Reading Confetti for the idea.

    Last Updated on March 23, 2014 by Emma Vanstone

    « Valentine Science Experiments
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    Safety Notice

    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

    Reader Interactions

    Comments

    1. Lorie

      February 06, 2013 at 2:04 pm

      Thanks for the link! We’re going to have to make some heart shaped rocks soon – my daughter would love it!

      Reply
    2. TheBoyandMe

      February 06, 2013 at 11:55 pm

      I was going to do this, failed abysmally!

      Reply
    3. Notmyyearoff

      February 07, 2013 at 11:41 am

      Such a good idea…it reminds me of a bath bomb (although I would never use vinegar and it probably wouldn’t fizz the same!)

      Reply
    4. Aida

      February 09, 2013 at 9:54 am

      really cool idea

      Reply
    5. LauraCYMFT

      February 09, 2013 at 2:48 pm

      That is very clever!

      Reply
    6. maggy, red ted art

      February 09, 2013 at 3:32 pm

      Another great science experience! *Lovely* to have something for Valentine’s!

      Thanks for sharing on Kids Get Crafty.

      Maggy

      Reply
    7. The Good Stuff

      February 09, 2013 at 5:50 pm

      way cool – love it…

      Reply
    8. Emma

      February 10, 2013 at 2:50 pm

      I really should do more of your experiemnets and not just look and think oh great idea!

      Reply
    9. Coombemill - Fiona

      February 10, 2013 at 5:19 pm

      What a great ideas – I can think of at least half a dozen kids that would try this.

      Reply
      • ScienceSparks

        February 10, 2013 at 8:59 pm

        Let me know if you do 🙂

        Reply
        • Preschool teacher

          February 19, 2013 at 2:32 am

          My attempt at making these had some kind of reaction that looked like mold after a couple of days. Does baking soda mold after its mixed with food coloring and water?

          Reply
          • ScienceSparks

            February 19, 2013 at 8:16 am

            I think it is the type of food colouring, was yours bake stable?

            Reply
            • Preschool teacher

              February 19, 2013 at 4:47 pm

              My food cooling was McCormick black I don’t see anywhere on it saying bake ready so maybe that is why I still am going to try this in the classroom because my 5 year old sat for a long time making the rocks fizz! Thanks for sharing!

            • ScienceSparks

              February 19, 2013 at 8:14 pm

              Brilliant, I’m glad you liked it.

    10. Emily

      February 10, 2013 at 10:03 pm

      We recently filled a volcano with cola and bicarbonate with incredibly messy consequences!

      Reply
    11. Stephanie

      February 11, 2014 at 3:22 am

      Can I use baking soda for this experiment?

      Reply

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