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Author: Subject: Experiment report: Cobalt Molybdate, amazing colors and a collloidal mystery
itsallgoodjames
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[*] posted on 28-10-2020 at 14:57


Quote: Originally posted by Bedlasky  

Quote: Originally posted by itsallgoodjames  
Wow, that's a really bright and vibrant purple. It's a shame it's as toxic as it is, it'd probably make a really nice purple dye.


It isn't that much toxic. But metal molybdates are slightly soluble, not much, but still. Cobalt phosphate is cheaper and much less soluble purple dye, similar in colour.


Still not something you'd probably want to be exposed to constantly though




Carbon is overrated. Inorganic chem is where it's at.
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MidLifeChemist
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[*] posted on 31-10-2020 at 21:22


Quote: Originally posted by Bedlasky  

Btw. I read that anhydrous CoMoO4 is green in colour (your CoMoO4 is monohydrate). You can try heat carefully small sample of it in test tube and see if it changes its colour.

[Edited on 21-10-2020 by Bedlasky]


I tried heating a sample a couple different ways, including with my propane torch. No change at 300C. I finally got it to change to grayish-blue color with high heat, but after an hour it changed back to purple. I never saw a green color. If there is a green anhydrous version, I was not able to make it.
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Bedlasky
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[*] posted on 1-11-2020 at 13:23


I read it on atomistry. But obviously it isn't true.



If you are interested in aqueous inorganic chemistry look at https://colourchem.wordpress.com/main-page/

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