This week I did two experiments. The first one is butterfly pea flower tea. First you put butterfly pea flower in water to make it blue, after that you put a small amount of citric acid in it and it will turn purple. If you put a lot of citric acid in it, it turns pink. How does it work? Inside of the flower has something called delphinidin which is a blue pigmant that changes perpel in the presence of small amounts of acid and pink in larg amounts of acid. If you were to add something very basic, like lim. We tried to make it green or yellow, but our stuf wasn’t basic enough.
This is what it looks like when you add the flowers to warm water.
See the rest of the experiment, when we added slightly acidic soda and straight citric acid here:
Our second experiment is known as “Elephant Toothpaste”.
By adding water, dish soap, hydrogen peroxide and yeast, we created this:FullSizeRender
The hydrogen peroxide is made up of 2 hydrogen molecules and 2 oxygen molecules (H2O2). The yeast is a catalyst, and 1 oxygen molecules escapes, then fills in the space in the soap, causing it to expand. In the end, we just have oxygen, soap, and water (H2O), so it’s actually safe to play with it.