Kids love making bath bombs! It’s an activity I have done in several settings and it’s always popular with both boys and girls. Most recently, I ran this as a school fair where it was so popular it was hard to keep up with demand! It is better in a more controlled setting such as a classroom or youth group.
The main things in a bath bomb that make it fizz are bicarbonate of soda (an alkali) and citric acid (an acid – clue’s in the name really). When these chemicals mix in water they react and form a gas (carbon dioxide), this gas is what causes the fizzy bubbles you see in the bath when you drop them in. The other chemicals in the bath bomb are there to make it smell nice or add effects to the water (e.g colour or glitter). If you ever make these yourself my top tip is only put a teeny tiny bit of glitter or petals or whatever in your bomb, believe me they get all over your bath as well as all over you!