Bath Bombs

State of Matter-science experiment

Description Of The Experiment

Follow these instructions to make your own bath bombs and learn about science while having fun in the bath!

Aim And Hypothesis

To create bath bombs as an experiment, our hypothesis is when you put the bath bomb in the water it would fizz up with bubbles and turn pink and sparkly.

Materials and Method

  • food colouring
  • flower petals or body glitter
  • sweet almond oil
  • scented oil such as lavender oil
  • 10 tablespoons of bicarbonate of soda
  • 3 tablespoons of citric acid
  • 2 large mixing bowls
  • 1 large muffin tray
  • 1 small glass jar
  • rubber gloves
  • spoon


  1. Grease the sides and bases of a large muffin tray with a small amount of almond oil.
  2. Place the citric acid and bicarbonate of soda into a large bowl. Mix the ingredients together well, to form the base mixture.
  3. Scoop out about half a cup of this mixture and put it in into another bowl. This will make about one or two bath bombs (depending on the size of the holes in your muffin tray). You could also use old plastic containers or anything that will hold a shape.
  4. Add the flower petals or body glitter to the base mixture.
  5. In the small glass jar, mix together 6 drops of your scented oil, 5 teaspoons of sweet almond oil and about 10 drops of food colouring.
  6. Gradually pour the oil mixture into the half cup of the base mixture. While wearing rubber gloves, quickly mix it all together. The mixture is ready when it stays together in your hands without crumbling too much.
  7. Spoon the mixture into the muffin tray. Press it down firmly.
  8. You can use the rest of the mixture with other types of scented oil or food colouring to make more bath bombs.
  9. Leave the bombs in the tray to set for a few days.
  10. Carefully up-end your bath bombs to remove them from the moulds.
  11. Run a bath, hop in and drop a bomb. Watch it fizzzzzz!


According to our experiment, our hypothesis was close to our experiment. It did turn out sparkly and pink but it did not fizz up. If you touch the water when the bath bomb is in the water, your hand will turn PINK!


Our hypothesis was that when we put the bath bomb in the water/bath it would fizz and bubble up and it would go sparkly and pink, but our hypothesis was not correct it turned out that when you put the bath bomb in the bath or water all the glitter came off the bath bomb, and floated into little groups and the water turned pink!