This experiment will amaze young kids – and even adults! It is so easy, but almost magical to watch. I love doing science for kids and have watched little ones become fascinated and inspired by our experiments. This is one their favourites – and mine! All you need is cabbage and a few materials from your cupboard to create this pH indicator.
We started by chopping up some red cabbage. Once cut, we put it into warm water. You can either let it sit and for 10-15 minutes, or you can put it into a blender.
Next, use a strainer to separate the cabbage from the water. You will be left with purple cabbage water. It is a really beautiful colour!
We stared by adding vinegar to the cabbage water. Make sure to watch closely because it changes quickly! Once you add the vinegar it changes the water from neutral to acidic. We can see this change by the colour change. It will change to a beautiful reddish colour.
Next, we added some baking soda, which will fizz a bit, but then turns from red to blue.
You can add vinegar to the blue water and turn it back to red. By doing this you are turning it from a base to an acid again – which we can see by the colour. Children had fun changing their colours back and forth between red and blue and testing what happens if they only add a small amount of vinegar or baking soda versus a lot.
You can try adding different other liquids from the kitchen, such as lemon juice and baking powder. Always make sure to supervise children when doing any science for kids and have fun!
For another science activity for kids for the summer click here. All you need are ice cubes and a few materials from home!