Tray
Baking soda
White vinegar
Water pistol/squirty bottle
Food colouring (optional)
What to do;
Put food colouring in the bottom of a tray and cover with baking soda.
Fill water pistols or it squirty bottles with vinegar.
Squirt the baking soda and watch the reaction.
When I did this I didn't tell the children that I put good colouring under it so it was a surprise to them when the colour came through.
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