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Subject
Red, White, and Blue lab?
I did this lab with middle school students today. We prepped the clear plastic cups with push pin holes and heated the salty water with a microwave. I used ice water for the fresh water. The results were vivid. I made the salty water red and the freshwater blue. The students were surprised that the drawings of their hypothesis were a murky purplish whereas the actual results were layers of red, white, and blue... success. These new ideas for labs are helping to make connections to oceans for the students.
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Tue, 10/23/2012 - 19:00
Hi Anne~ Yes! It was really fun to watch the changes at 1 min, 5 min, 10 minutes and even the next day. There was a steady streak of blue (cold, fresh H20) in the middle for a while, until the red (hot salt H20) started to drop to the bottom. There was also a layer of original, clear water in the very middle when the blue began rising to the top. The next day it was a perfect bluish on top and darker red on the bottom; while the cups still had some color on the bottom, but they had filled up on the top about 3/4 with the clear water...very, very cool. I was able to do this with my 3, 4, 5, 6 ,7 & 8th grade Science classes!
Sun, 10/21/2012 - 09:31
Did the layers of red and blue rise/fall over time as the temperatures changed?