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Author Topic: Short Questions Thread  (Read 10820 times)

Naf1

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Re: Short Questions Thread
« Reply #520 on: May 08, 2010, 01:14:31 AM »
Quote
It broke just below the stop cock. It just wont fit any more ground glass joints

It should not have in the first place, unless it is an addition funnel! You said in the first post the neck broke which is where the ground glass socket would be, on a sep funnel under the stopcock there should not be any ground glass joints.

Sep Funnel

Addition Funnel

drone1240

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Re: Short Questions Thread
« Reply #521 on: May 08, 2010, 01:20:54 AM »
Whoops its an addition funnel.
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Naf1

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Re: Short Questions Thread
« Reply #522 on: May 08, 2010, 01:35:04 AM »
It WAS now its a sep funnel ;D

Everyone needs to break something to learn to take care, be thankful it was not an expensive piece!

Vesp

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Re: Short Questions Thread
« Reply #523 on: May 08, 2010, 02:14:20 AM »
It may be possible and may not need annealing, that is just something I'd personally be worried about. If it seems to fit well together, what about the idea of putting a fairly resistant (to solvents, etc) plastic tube that fits snugly on both ends, and connects the two?
Not really the best idea, but it might work for your needs.
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hypnos

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Re: Short Questions Thread
« Reply #524 on: May 11, 2010, 01:39:43 AM »
exactly the same thing happened to mine :-[..tubing is the answer ;)
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drone1240

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Re: Short Questions Thread
« Reply #525 on: May 11, 2010, 08:12:17 PM »
It broke right at the base of the tear. Its still functional and even if it wasnt I could never bring myself to toss it.

Hey do you fellas know a few cool reaction one could try? Just to bump exp points in reaction mechinisms, asssembly and dissassembly and of course accident prevention. Totally legal of cours.  Didn't someone say they were doing organic reactions in the 8th grade?What were they or does any one else know a few cool prerequistes? thanks....D
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Vesp

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Re: Short Questions Thread
« Reply #526 on: May 12, 2010, 12:21:43 AM »
Quote
Hey do you fellas know a few cool reaction one could try? Just to bump exp points in reaction mechinisms, asssembly and dissassembly and of course accident prevention. Totally legal of cours.  Didn't someone say they were doing organic reactions in the 8th grade?What were they or does any one else know a few cool prerequistes? thanks....D

Well, depending on your glassware set up I would work on doing distillation, reflux, and a few things like that, perhaps distill some alcohol from yeast and sugar? nitric acid?,  Perhaps work on making hydroquinone? or an ester of salicylic acid with methanol or other alcohols to form scents... haloform reaction with acetone and bleach to produce chloroform?

What is it that you are interested in, or want to do?
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mumbles

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Re: Short Questions Thread
« Reply #527 on: May 12, 2010, 05:26:43 AM »
Distillation, reflux, recrystallization, and solvent extraction + washing (and the obligatory a/b of course) are the real core skills swiy will need to practice for chemistry in general. Through google you can usually find teachers notes for various year 12 -> uni level units, they will give you a few easy things to try out.

NeilPatrickHarris

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Re: Short Questions Thread
« Reply #528 on: May 19, 2010, 02:38:18 AM »
i've browsed some msds sheets and didn't find any problem but wanted to ask the experts.... this is a storage question about metal salts.

can these metal salts be stored near each other?  i didn't find any references to incompatibilities that would lead me to believe otherwise:
Cupric Chloride
Nickel Acetate
Nickel Oxide
PdCl2

Vesp

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Re: Short Questions Thread
« Reply #529 on: May 19, 2010, 03:00:18 AM »
As long as they are not mixed, or in a metal container, I do not see why they should not be stored by one another, it doesn't appear any would have a violent reaction with one another, or form any toxic, at least.. not any more toxic metal salts than that already exists -- besides, the odds of them mixing and reacting by accident is fairly unlikely, right?
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NeilPatrickHarris

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Re: Short Questions Thread
« Reply #530 on: May 19, 2010, 03:22:07 AM »
Quote from: Vesp on May 19, 2010, 03:00:18 AM
As long as they are not mixed, or in a metal container, I do not see why they should not be stored by one another, it doesn't appear any would have a violent reaction with one another, or form any toxic, at least.. not any more toxic metal salts than that already exists -- besides, the odds of them mixing and reacting by accident is fairly unlikely, right?

yeah they're all in individual small containers within this big container.  all containers are hdpe

poisoninthestain

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Re: Short Questions Thread
« Reply #531 on: May 19, 2010, 11:50:33 PM »
Anyone with experience seperating H3PO3 with heat? I have a solution of polymaleic acid with H3PO3 and hoping to seperate it through distillation of the polymer at ~102C. I'm just a fair bit concerned about oxidizing H3PO3 in the process of around 100C? If not I might freeze precip the other out and sep any solid that doesn't float(density 1.2 vs. 1.6 or something). I wonder if that H3PO3 would reduce the -OH function on the maleic acid in the process. Thoughts? I could always just use a phosphite salt but this has been interesting to me. Paid $5 for a 500ml of the two in solution as a descaler.
« Last Edit: May 20, 2010, 02:18:42 AM by poisoninthestain »

java

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Re: Short Questions Thread
« Reply #532 on: May 23, 2010, 01:33:09 PM »
.....have been pondering on the Cleisen Rearrangement  of c6h5-ch2-ch2-(0-ch3) , following the rearrangement  it would make phenylacetone.......it's a question not a fact and what would the ether be called.......java
¡Prefiero morir de pie que vivir siempre arrodillado!.Emiliano ZapataIt is better to die on your feet than to live on your knees!.......

mumbles

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Re: Short Questions Thread
« Reply #533 on: May 25, 2010, 08:26:56 AM »
Quote from: poisoninthestain on May 19, 2010, 11:50:33 PM
Anyone with experience seperating H3PO3 with heat? I have a solution of polymaleic acid with H3PO3 and hoping to seperate it through distillation of the polymer at ~102C. I'm just a fair bit concerned about oxidizing H3PO3 in the process of around 100C?
Swim remembers something about H3PO3 decomposing to phosphine under heating. Wiki is telling me 200c but I could have sworn it was lower than that.

poisoninthestain

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Re: Short Questions Thread
« Reply #534 on: May 25, 2010, 10:15:37 AM »
True Mumbles. After some experimentation I found out that it's impractical and inefficient to separate H3PO3 through distillation of one of it's formulations. It was a fun thought while it lasted. Can it be done yes. But it's not worth it.  I'll stick to the usual phosphites. On a side note, H3PO3 isn't strong enough alone to reduce a phenolic hydroxyl.  :P

timecube

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Re: Short Questions Thread
« Reply #535 on: May 27, 2010, 07:13:18 AM »
There's an OTC solvent that contains a mixture of methanol and dcm.  Of course it should be distilled, but if it is used as is to attempt to extract an aqueous layer will some sort of emulsion form, or will the organics come into a clearly divided dcm layer with some methanol dissolved in both the aqueous and dcm layer?

Enkidu

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Re: Short Questions Thread
« Reply #536 on: May 27, 2010, 07:39:08 AM »
Why not just wash the solvent with water.. then you'll be left with DCM

Sedit

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Re: Short Questions Thread
« Reply #537 on: May 27, 2010, 01:13:39 PM »
Neither of these suggestions will work since ALL OTC DCM mixtures I have seen contain higher parrifins and gels. You need to mix with an equal volume of H2O and distill. If no water is used it quickly turns to a cement that will be a pain in the ass to distill. The BP of DCM is so low its comes over extremely quick even in a hot water bath. Best just distill in under a water bath and wash that with H2O to remove any trace methanol present else your adding to many variable that are going to cause issues.
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Enkidu

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Re: Short Questions Thread
« Reply #538 on: May 27, 2010, 08:23:43 PM »
^ I don't think timecube would have suggested using the solvent as is unless it didn't contain any of that gelled crap.

drone1240

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Re: Short Questions Thread
« Reply #539 on: May 27, 2010, 09:05:39 PM »
Is it okay to start topics and post write ups of some of my experiments even though they seem simple to most? ie haloform reaction, distilling hooch ect ect
acting in accordance with the dictates of reason....
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