Precipitate in a jar or glass pan?

[Oneletter]

So I've been reading and trying different teks. The first ones I did said to precipitate in a glass dish. The last Tek I did said I should precipitate the crystals in a glass mason jar and pour the naphtha through a coffee filter. Then try your best to scrape the sides.

I just used the Pyrex dish since I know that way works. Does anyone have experience using the jar method? How do you collect the crystals from the coffee filter?

 

[Spaced Out 2]

Stay with the dish, much harder to get out of mason jar. If poured out carefully you shouldn't need a coffee filter but if you need one pour through a funnel lined with filter and then set out to dry completely and then scrape off the filter.

 

[Oneletter]

Ok thanks. It seems to be working fine using the dish. So the crystals will come right up from the filter when you scrape them? Won't there be any filter material in the scraping?

 

[Spaced Out 2]

I think some will stick but you would scrape lightly, I would stick with the dish. I'm thinking that the filter is needed if you have a bunch of floaters but even then if you pour off your solvent carefully you shouldn't lose any, I usually have a few floaters and if I pour slowly then they just settle to bottom, no filter needed.

 

[1ce]

Here's food for thought,

Crystals can only form inside of the solvent, so if you spread the solvent thin (plate spreads it thin, so you're more likely to have powder) wheras a deeper glass offers more room for xtals to form, so you'll wind up with larger formations.

Something to consider, 1ce.

 

[concombres]

^ test tubes are nice for re-x.
I like to partially submerge a tall test tube in a flask on a hotplate at 100°f, fill with 20ml heptane & allow to come up to temperature.
Then drop some already cleaned teansparent/white spice powder in every few minutes with a lab spatula until no more will dissolve, then drop the temp by 20°f every couple hours allowing for internal temperature to stabilize before lowering again.
Usually i'm able to get some nice sized crystals with such a skinny container but havn't been able to get them to form a single solid chunk the way i expected them to yet :lol:

 

[Oneletter]

Here's food for thought,

Crystals can only form inside of the solvent, so if you spread the solvent thin (plate spreads it thin, so you're more likely to have powder) wheras a deeper glass offers more room for xtals to form, so you'll wind up with larger formations.

Something to consider, 1ce.

I think I'll try a jar next time. Just once... And if I like it I'll do it more.