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February 15, 2013
The Finest Blue in the Lab
For Friday afternoon, a bit of chem-geekery. I recently had occasion to use some copper sulfate, and the bottle I had was marked "large crystals" of the pentahydrate. I have loved the color of that stuff since I was a kid, and still do. Powdered, you lose a lot of the effect, but the chunks of crystalline stuff are the very definition of blue. (Photo from egeorge96 on Flickr).
Does anyone know a better one? That's my candidate for the solid phase. In solution, the complex of copper II and pyridine is a good one, a bit more towards royal blue/purple. You can definitely see the change when the pyridine hits it. I can't find a photo of that one on the web; if anyone has one, I'll be glad to post it. More colors to come on other slow Friday afternoons.
Update: a rare gas-phase blue (!) from the comments. Never seen that before!
And another one from the comments: here's someone who really, really, really likes copper sulfate. Here's how it was done.
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