The experiment was the famous Testing pH with Red Cabbage project, something about which I have read for years but never experienced.
Starting with a red cabbage and a blender:
|Leftover cabbage pulp after draining.|
|Red cabbage puree - unfortunately the picture doesn't do justice to the gorgeous purple color!|
The puree is added to various household chemicals (ammonia, vinegar, baking soda solution, etc.) and the resulting color is an indicator of pH. According to the aforementioned link,
pH 2 = red
pH 4 = purple
pH 6 = violet
pH 8 = blue
pH 10 = blue-green
pH 12 = green
The color changes were dramatic - and beautiful!
|Results (after adding cabbage extract) left to right are: Baking soda solution, ammonia, vinegar|
They had a great time - this was definitely a keeper. It's very easy and inexpensive to do - buy a red cabbage and round up some household chemicals you probably already have, and you're set.
I love home education! In my entire elementary school years, we did a total of perhaps two science experiments. Now that I'm getting to do science experiments weekly with my children, I feel like I am educating them and making up for all that I missed. It's awesome, and we're really enjoying the fun and great learning.