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Home » Early Years Science » Sensory and Messy Play » Fizzy baking soda stars

Fizzy baking soda stars

Modified: Oct 15, 2016 · Published: Sep 23, 2015 by Emma Vanstone · This post may contain affiliate links · 1 Comment

One of the activities my children ask for over and over again is a bowl of cornflour gloop. It’s so easy to make and keeps everyone happy for hours, although it is a little on the messy side, so I’d definitely set it up outside if at all possible.

To make the gloop even more fun I added some baking soda and food colouring and froze it into a star shape. Once frozen we added vinegar to make lovely gooey, fizzy stars.

baking soda stars

Materials

Baking soda

Cornflour

Shaped mould

Pipettes

Vinegar

Food colouring – optional

Method

Pour the cornflour into a bowl, you can use as much or as little as you want.

Slowly add water until you get a thick, smooth consistency.

Add a couple of tablespoons of baking soda and mix well.

Pour into your shaped moulds and add food colouring to each.

Leave in a freezer till set.

Once frozen carefully remove from the mould, you might have to let it warm up a little.

Use a pipette to drop vinegar onto the frozen shapes.

Watch the fizz.

baking soda stars

 

Why does this happen?

Bicarbonate of soda – baking soda is alkali which reacts with acids to produce carbon dioxide, the carbon dioxde is the bubbles you see.

Extension Ideas

Can you make the stars or shapes using different amounts of baking soda and comparing the fizz produced?

Try one of our other baking soda experiment ideas.

baking soda stars

Contains affiliate links

Last Updated on October 15, 2016 by Emma Vanstone

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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. Anya from Older Single Mum and The Healer

    September 23, 2015 at 9:31 pm

    You are full of genius yet simple ideas and these are perfect, thank you 🙂 x

    Reply

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