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Texium
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Posts: 4580
Registered: 11-1-2014
Location: Salt Lake City
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Mood: PhD candidate!
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I thought that copper(II) dichromate wasn't a thing...
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Amos
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Yeah, I'm thinking that was just a mixture of copper sulfate and dichromate in solution.
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Zephyr
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Possible, but in that case I'm not sure what my precipitate was.
Maybe copper hydroxide, although I used a stoichiometric amount of NaOH so that would be unlikely.
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Texium
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Registered: 11-1-2014
Location: Salt Lake City
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Yes, adding the NaOH precipitates copper(II) chromate, which is definitely a real compound, but this copper(II) dichromate that you claim seems
unlikely. As Amos says, it's likely just a solution that happens to contain copper and dichromate ions, though it is unlikely that this would
crystallize as a genuine copper dichromate. Not that it really matters, since even without that, you still have the most compounds.
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DraconicAcid
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Hey- PinkHippo had two reactions starting from copper metal.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Zephyr
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Yep, I didn't count the first one though, I was only counting the products. Honestly I just didn't have any copper acetate laying around and it was
easier to start from the metal.
As for the copper chromate, that's probably the reason.
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Volanschemia
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Huh, you're right. I must have missed that one.
Technically, the starting material counts in the chain, but it still makes no difference to whether you win or not, even if you remove the first step
and start from Copper(II) Acetate.
"The chemists are a strange class of mortals, impelled by an almost insane impulse to seek their pleasures amid smoke and
vapor, soot and flame, poisons and poverty; yet among all these evils I seem to live so sweetly that may I die if I were to change places with the
Persian king" - Johann Joachim Becher, 1635 to 1682.
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The Volatile Chemist
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Posts: 1981
Registered: 22-3-2014
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Good job everyone! There were some cool compounds I wanted to make, so I mixed up a whole bunch of CuCO3 to isolate, and...well, the 'cakes' of it
from my new vac. filter kit turned to a slushy of Cu(OH)2. Maybe experimental chemistry isn't for me  (Or at least, for my basement... :/)
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aga
Forum Drunkard
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Registered: 25-3-2014
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You got a Buchner setup now ?
Cool !
Add a trap for crap before it gets into the Oil of the vac pump.
My pump oil is a funny colour now.
Still works, but better to make trap out of a jam jar or something.
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DraconicAcid
International Hazard
Posts: 4332
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Location: The tiniest college campus ever....
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Mood: Semi-victorious.
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We going to do this again this year? It was fun.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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The Volatile Chemist
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Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
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Mood: Copious
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Heck yeah it was! I'll contribute a few dogecoin to the reward pot (it's all I've got, sorry...)
Aga, yeah, though it's a hand pump. I could set up a trap with one of my dinky 50mL filtering flasks.....
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