TinyStepper
Toddler at a table covered in colourful paint splotches, grinning with pride

Fizzy Colour Volcano

Pour vinegar onto baking soda and food colouring for a fizzy, colourful eruption that never gets old.

Activity details

18m–4y15 minslowbothFood ColouringPlastic ContainersSmall Pitcher

Instructions

Get ready
  • Place a tray or baking dish on a protected surface
  • Spoon baking soda across the tray in little piles
  1. Place a tray or baking dish on a protected surface
  2. Spoon baking soda across the tray in little piles
  3. Add drops of different food colouring onto each pile
  4. Give your toddler a small jug or pipette filled with white vinegar
  5. Let them pour or squeeze vinegar onto the soda: 'FIZZ!'
  6. Watch the colourful eruption together: 'Look at the bubbles!'
  7. Add more soda and colour for round two, three, four, five...
  8. When finished, the fizzy liquid makes a lovely swirled painting if you press paper into it

Parent tip

Set out food colouring and plastic containers before inviting your toddler in so the first minute feels smooth.

Proud child holding up a painted sheet covered in bright handprints and splatters

What success looks like

Messy hands and a child who doesn’t want to stop. The artwork doesn’t need to look like anything — the process is the point.

Put a spoonful of baking soda in a tray, add drops of food colouring, and hand your toddler a small jug of vinegar to pour on top. The fizzing eruption of colour is endlessly thrilling. Let them repeat it — soda, colour, pour, FIZZ — as many times as they like. The chemical reaction is harmless, the sensory payoff is enormous, and the cause-and-effect learning is instant. Toddlers will do this twenty times in a row without tiring of it.

Why it helps

The EYFS framework places understanding cause and effect at the heart of early cognitive development, recognising it as a building block for scientific and mathematical thinking. The fizzing reaction provides multi-sensory feedback — visual (bubbles, colour mixing), auditory (hissing), and tactile (tingling foam) — that engages three sensory systems simultaneously. The cause-and-effect relationship (pour → fizz) is immediate and reliable, which is the foundation of scientific reasoning. Repetition is not boredom here — each repeat builds the toddler's prediction skills and understanding of variables like 'more vinegar = more fizz.'

Variations

  • Use pipettes or syringes instead of jugs for fine motor precision practice.
  • Bury small toys in the baking soda for a 'fossil dig' — the vinegar reveals them.
  • Take it outdoors in a large container for mega-eruptions with no cleanup worries.

Safety tips

  • Vinegar can sting eyes — keep the toddler's face away from the tray and supervise pouring.
  • Food colouring may stain clothes and surfaces — use old clothes and a wipe-clean surface.
  • Ensure baking soda is food-grade and non-toxic, though ingestion should still be avoided.

Want to try another?

Oobleck Goo Pool

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