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    Home » Early Years Science » Fizzy Hidden Coin Pirate Rocks

    Fizzy Hidden Coin Pirate Rocks

    Modified: Jul 14, 2021 · Published: Feb 18, 2015 by Emma Vanstone · This post may contain affiliate links · 1 Comment

    These fizzy pirate coins are super simple to make and lots of fizzy fun. We used food colouring to make the baking soda look like rocks and added shiny coins for the children to find.

    First we cleaned up some pennies to be our shiny pirate coins. To do this we simply placed them in coca cola and vinegar. You can see from the second photo both did a good job. The coin in the middle was in water for the same amount of time.

    Coins soaking in vinegar to clean them
    shiny coins after soaking in vinegar
    Coins cleaned after soaking in vinegar

    Once we had our shiny coins we set about making the rocks.

    What you need to make fizzy pirate rocks

    Baking soda

    Food colouring

    Water

    Coins

    Vinegar

    Optional – flour

    Instructions

    Pour your baking soda into a bowl and add water slowly until it makes a paste.

    Add a couple of drops of food colouring and mix well.

    Either mould with your hands or use cake moulds to create shapes. Press a coin into each.

    Leave in the fridge overnight.

    If you wanted to pad out the baking soda a little, add some flour when you mix. As long as it’s not more than half and half you should still get a good reaction.

    fizzy pirate rocks made with baking soda

    We added some coloured rice to make it look a little more appealing and then used a pipette to drop vinegar onto the coins.

    fizzy pirate rocks

    Why does this happen?

    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.

    More fizzy pirate fun

    These exploding treasure chests from Fun A Day look brilliant!

    Little Bins for Little Hands has a fantastic fizzy pirate sensory sink!

    Make fizzy baking soda rocks and hide pirate coins inside. Fun pirate science experiments for kids #pirates #pirateparty #piratescience #piratepartyideas #piratesforkids

    Last Updated on July 14, 2021 by Emma Vanstone

    « Which material makes the best dress up pirate sword?
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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.

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