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    Home » Science Experiments for Kids » Chemistry » Fizzing rocks

    Fizzing rocks

    August 31, 2012 By Emma Vanstone 23 Comments

    We love a good baking soda experiment. I spotted this brilliant and very simple idea on Reading Confetti, who kindly said I could post about it here. These are our fizzing rocks.

     

    Fizzing rocks

    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.

     

    Fizzing rocks

     

    fizzing rocks

    The Science bit

    Vinegar (an acid ) and bicarbonate of soda ( an alkali ) react together to neutralise each other. This reaction releases carbon dioxide a gas which is the bubbles you see.

    Other ideas

    Add small objects to the rocks and drop them into a bowl of vinegar like Reading Confetti did.

    Make one big rock and see how much vinegar is needed to totally dissolve it.

    We also have a Valentine version of this. Can you think of any other ideas?

    Make sure you check out some of our other fun science for kids posts.

    Related posts

    More Baking Soda Experiments

    Monster Tea Party

    Baking Soda powered boat

    Baking Soda Volcano

    Baking Soda Popper

     

     

     

     

    Last Updated on January 25, 2016 by Emma Vanstone

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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

      August 31, 2012 at 1:13 pm

      Thanks for the link. Love your idea of making one big rock. We might have to try that next!

      Reply
      • ScienceSparks

        August 31, 2012 at 1:23 pm

        I’m glad you spotted it! We had so much fun 🙂

        Reply
    2. Ashley

      September 01, 2012 at 12:30 am

      I like that you made your own fizzing rocks! We may have to try that sometime.

      Reply
      • ScienceSparks

        September 05, 2012 at 8:15 pm

        you should it was great!

        Reply
    3. Deborah

      September 01, 2012 at 3:12 am

      Oh – this idea really does rock!!

      Reply
      • ScienceSparks

        September 05, 2012 at 8:15 pm

        🙂 Ha ha

        Reply
    4. maggy, red ted art

      September 01, 2012 at 1:22 pm

      Oooh this looks like great fun. Love the addition of colour.

      Maggy

      Reply
      • ScienceSparks

        September 05, 2012 at 8:14 pm

        Thanks Maggy, it was very fun!

        Reply
        • maggy, red ted art

          September 06, 2012 at 5:17 pm

          PS Thanks for sharing on Kids Get Crafty!

          Reply
    5. The fairy and the frog

      September 01, 2012 at 5:53 pm

      looks great fun

      Reply
      • ScienceSparks

        September 05, 2012 at 8:14 pm

        IT was great!

        Reply
    6. JDaniel4's Mom

      September 01, 2012 at 10:51 pm

      This really looks like fun!

      Reply
      • ScienceSparks

        September 05, 2012 at 8:14 pm

        It really was!

        Reply
    7. 4th Grade Science Fun

      September 04, 2012 at 4:17 am

      Try this: make a batch, make small balls out of it in one color and let it dry. Then make a second batch, make it a different color, wrap it around the first balls and let dry. When you add the vinegar, the outside fizzes away in one color, then the inside ball fizzes a second color. Next we want to try putting something inside like you suggested.

      Reply
      • ScienceSparks

        September 05, 2012 at 8:14 pm

        oooh that sounds fantastic! Thanks for the idea.

        Reply
    8. Beth

      September 06, 2012 at 11:34 am

      How fun! You guys always have the neatest experiments!!! Thanks for linking up to TGIF! Looking forward to seeing you linked up again tomorrow =-)
      Beth

      Reply
      • ScienceSparks

        September 07, 2012 at 8:44 pm

        Thanks Beth!

        Reply
    9. Sarah

      October 14, 2016 at 11:41 pm

      Great idea! I’m going to add this to my list of fun baking soda & vinegar activities with my kids. Thank you!!!

      Reply

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