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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.

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

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Comments

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
TheBoyandMe

February 06, 2013 at 11:55 pm

I was going to do this, failed abysmally!

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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
Aida

February 09, 2013 at 9:54 am

really cool idea

Reply
LauraCYMFT

February 09, 2013 at 2:48 pm

That is very clever!

Reply
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
The Good Stuff

February 09, 2013 at 5:50 pm

way cool – love it…

Reply
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
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.
Emily

February 10, 2013 at 10:03 pm

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

Reply
Stephanie

February 11, 2014 at 3:22 am

Can I use baking soda for this experiment?

Reply

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