Borax ornaments

I subbed in a physics class Friday. While students were creating bridges from balsa wood, I started preparing a borax solution for their borax crystal ornaments. I asked the teacher what strength of solution I needed to make. He said, “Just stir in as much borax as the water will hold.” He had left a box three-quarters full of borax, a Dutch oven and the bottom of a double boiler. I filled the pots with water and put them on the stove. As I heated the water, I stirred in borax. When the borax dissolved, I added more and continued stirring. Eventually, I poured in the entire contents of the box. When the water started boiling, I removed it from the heat and poured it into three beakers. After they had cleaned up their bridge project, students began shaping pipe cleaners into ornaments. Students tied string around their ornaments and a colored pencil. We suspended the ornaments in the borax solution.

When the basketball teams returned from their game that night, coaches were to remove the ornaments from the beakers. Picture shows how we hope they turn out.