Make fizzy bath bombs

Make fizzy bath bombs

Add some fizz to the bath

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Enjoy the perfect relaxing bath with a little bit of simple chemistry...

You know the things you put in the bath and they make the water fizz and smell nice? They're bath bombs. You can make your own!

What you need:

  • Food colouring
  • Sweet almond oil or other light vegetable oil
  • Essential oil (make sure it is suitable to put in bath bombs and that it's not for oil burners or candles)
  • 10 tablespoons bicarbonate of soda
  • 3 tablespoons of citric acid (you can buy this from chemists and some supermarkets)
  • Large mixing bowls - glass works best
  • Muffin tray or other mould
  • Small glass jar
  • Mixing spoon
  • Whisk

How to:

  1. Use the almond oil to lightly grease the muffin tray or mould.
  2. Mix the citric acid and bicarbonate of soda together in a glass bowl. Make sure you get any lumps out.
  3. Mix together 12 drops of your essential oil, 10 teaspoons of sweet almond oil and 15-20 drops of food colouring. Don't use any more food colouring, otherwise it will turn your bath a funny colour!
  4. Gradually pour the oil mixture into the dry mixture, stirring well. If the mixture starts to foam, you're adding the oil too quickly. The mixture is ready when it has the consistency of damp sand.
  5. Spoon the mixture into the muffin tray and press down firmly. It should make 2-4 bath bombs, depending on the size of your muffin tray.
  6. Leave the bath bombs to set for a few days.
  7. When you want to use one, carefully take it out of the mould and drop it into your bath.

You can make different kinds of bath bombs, using different essential oils, different food colouring, flower petals or body glitter. They make great presents!

What's happening?

When you drop your bath bomb into water, this sets off a chemical reaction between the citric acid and the bicarbonate of soda. During the reaction, carbon dioxide is made, which causes the fizzing. The almond oil moisturises your skin and the essential oils smell nice.

Curriculum information

  • Summary


    Curriculum key wordsOther web links
    • 5
    Science Curriculum Links
    National CurriculumCurriculum for excellenceNorthern Ireland Curriculum