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Cathoderay
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I have heard of coating the inside of the container with wax.
Don't let the solution get between the wax and the container though.
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yobbo II
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Perhaps an untra-violet light would help with the microbes?
Yob
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SnailsAttack
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Quote: Originally posted by knowledgevschaos  | | A few people seem to have trouble with a crust of crystals creeping up the edges of the container. I've had this problem too, particularly with copper
sulfate. My theory is that this happens because the meniscus on the glass draws the solution up into a thin layer that evaporates more rapidly.
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Yeah, I think it's a capillary pumping effect. NaCl and NH₄H₂PO₄ do it, and the puffy white crystals
formed by Ca(CH₃COO)₂ seem to be dictated almost entirely by this effect, although it manifests very differently than with the previous two salts.
| Quote: Originally posted by knowledgevschaos | | I think that by rubbing the glass with an oil / petroleum jelly, the container would repel water, and this wouldn't be a problem. I haven't been able
to test this yet though. |
Huh, I might give that a try as well.
I've
had potassium bitartrate go moldy; no surprise that rochelle salt would do it as well.
I've spent months recrystallizing some
monoammonium phosphate that had a bunch of food dye in it and it's never grown mold; that's not to say it couldn't happen, though.
Yes, this happened to me as well, except mine was also incredibly alkaline. Posted about it here. The replies are very interesting. Thread is illustrated nicely by Mayko and Metacelsus:
| Quote: Originally posted by mayko | tied for first: these crudlings, surviving in the face of impressive osmotic stress and feeding on ... ?
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Sir_Gawain
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Nickel Sulfate Crystal
This one took about a month and a half.
It's actually much more green than the camera shows.
“Alchemy is trying to turn things yellow; chemistry is trying to avoid things turning yellow.” -Tom deP.
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DraconicAcid
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Wow!
Don't put nickel compounds on your skin.
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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Sir_Gawain
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Yeah, I washed thoroughly afterward.
“Alchemy is trying to turn things yellow; chemistry is trying to avoid things turning yellow.” -Tom deP.
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Eithern
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| Quote: Originally posted by knowledgevschaos |
A few people seem to have trouble with a crust of crystals creeping up the edges of the container. I've had this problem too, particularly with copper
sulfate. My theory is that this happens because the meniscus on the glass draws the solution up into a thin layer that evaporates more rapidly. I
think that by rubbing the glass with an oil / petroleum jelly, the container would repel water, and this wouldn't be a problem. I haven't been able to
test this yet though.
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Guys I had the same problem recently with ammonium nitrate, what do you think about using non-stick pans as crystallization dishes?
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knowledgevschaos
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I think that would work, as far as I know teflon repels water. What was your goal with the ammonium nitrate? It isn't a material usually used to grow
crystals, and I'd be curious to know what the crystals look like.
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