Bath Bomb Observations

Our first science elective lesson was based on acids and acalines, we had to observe the chemical reactions between the citric acid and baking soda. We each created a bath bomb for mothers day, using the ingredients listed below we mixed them together then left them to set overnight.  

This is what we observed: When a bath bomb comes in contact with water, the baking soda and citric acid react to make carbon dioxide bubbles. This is an acid–base reaction, where baking soda (also called sodium bicarbonate) is a weak base and citric acid is a weak acid.    

This is the bath bomb recipe you will need: (dry) - 1 cup of baking soda 1/2 cup of citric acid 1/2 cup of epsom salt (wet) - 1 tsp of water 1 tsp of essential oil 3 tsp of olive oil / coconut oil / Almond oil 2-3 drops of food coloring Measure out and whisk together your dry ingredients in a large bowl. Next, in a small cup, mix together the wet ingredients. This is also where you’ll add the essential oils. The next step is very important. Add the wet ingredients to the dry ingredients. You’ll want to do this very slowly, adding little drops at a time while mixing. The citric acid is what causes the bath bombs to fizz when it comes into contact with water. Adding the wet ingredients slowly minimizes this affect. Then, firmly press the mixture into the mould. Let the bath bombs dry for at least 24 hours.

I enjoyed observing the chemical reaction between the different ingredients, (the acid and the alcaline) I also enjoyed mixing the ingredients together, it felt not quite sticky and not quite dry. It was a bit like kinetic sand if you've ever felt it.