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CharlieA
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Per Lange's Handbook of Chemistry, 15the ed.: sol 0.17 g per 100 parts water; sol in acids! (duh; I guess we expected that!)
From Wikidedia's solubility table: the solubility of Ca(OH), per 100 mL varies from 0.189g at 0*C to 18.4g at 100*C.
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khourygeo77
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Ethanol - Ammonia in water reaction?
I brought ethanol and got some smelling salts then reacted them with sodium carbonate. I finally got water, with ammonia inside. I am looking to react
them with each other to possibly get pyridine and some oils? Or I'd get nothing unless I add some kind of catalyst like sulfuric acid...
I saw the results of acetone - ammonia in water reaction, and it seemed interesting btw.
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DraconicAcid
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Ammonia will not react with ethanol.
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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JJay
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What is a good, cheap analytical balance that is commonly available used?
I seem to recall that Ohaus is highly respected, and I see several that will weigh to 0.1 mg available at semi-reasonable cost. Would one of these be
a good choice?
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Texium
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Threads Merged
11-2-2017 at 06:29 |
Texium
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Probably not what you're looking for, but I recently bought an old circa 1960 Mettler mechanical analytical balance. It has a maximum capacity of 200
grams and is accurate to .0001 grams. It certainly takes longer to weigh things with it, but I think it's rather fun to use, and I like the look of
it. Also it only cost $125.
https://texium.wordpress.com/2017/01/08/recent-acquisition-v...
There are a lot of them available on eBay and other sites. As with modern balances, different models have different levels of precision and different
max capacities. You could probably find one locally if you looked.
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JJay
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That does have a pretty cool, retro look.
I'm not seeing anything locally better than what I have offhand, but I should probably check the university surplus store.
[Edited on 11-2-2017 by JJay]
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Sulaiman
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Per Lange's Handbook of Chemistry
based on CharlieA's answer above, I lookedfor a pdf of the book,
very useful ... get a copy quick !
http://fptl.ru/biblioteka/spravo4niki/dean.pdf
CAUTION : Hobby Chemist, not Professional or even Amateur
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Sulaiman
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zts16
I think that the last photo of your blog shows 005.0002 g
005.0 from the digital scale
the zero of the vernier scale on the right is between 00 and 01 of the main scale, so the next two digits are 00
the two scales are coincident at 2 on the vernier scale, the last digit.
[Edited on 11-2-2017 by Sulaiman]
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DraconicAcid
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Quote: Originally posted by TheNerdyFarmer  | What is calcium hydroxide soluble in. And for future reference, how to do find the solubility of chems in organic solvents and alcohols ect. I can
never find it online.
[Edited on 10-2-2017 by TheNerdyFarmer] |
Solubility data of inorganic materials in organic solvents is generally tough to find. They generally dissolve better in alcohols than in other
organic solvents, and will dissolve best if there is a mismatch in size between the cation and the anion. Lithium salts will be more soluble than
sodium or potassium salts, and tetraalkylammonium salts will be even more soluble. Ionic compounds with limited solubility in water are even less
likely to dissolve in alcohols and other organic solvents. The exception to this is solvents which strongly coordinate metal cations, such as
acetonitrile. Acetonitrile is an excellent solvent for many transition metal compounds (such as Copper(I) chloride, which is water-insoluble).
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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CharlieA
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@zts16: The Mettler is a heck of a bargain. I remember the first time I had a chance to use one. I couldn't believe the difference between it and the
double-pan balance with free weights that I had been using in school I admit I didn't read your blog entry thoroughly, but I would adjust the Vernier
scale with the standard mass on the pan.
I might have to start looking a a Mettler
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TheNerdyFarmer
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| Quote: Originally posted by DraconicAcid | | Quote: Originally posted by TheNerdyFarmer | What is calcium hydroxide soluble in. And for future reference, how to do find the solubility of chems in organic solvents and alcohols ect. I can
never find it online.
[Edited on 10-2-2017 by TheNerdyFarmer] |
Solubility data of inorganic materials in organic solvents is generally tough to find. They generally dissolve better in alcohols than in other
organic solvents, and will dissolve best if there is a mismatch in size between the cation and the anion. Lithium salts will be more soluble than
sodium or potassium salts, and tetraalkylammonium salts will be even more soluble. Ionic compounds with limited solubility in water are even less
likely to dissolve in alcohols and other organic solvents. The exception to this is solvents which strongly coordinate metal cations, such as
acetonitrile. Acetonitrile is an excellent solvent for many transition metal compounds (such as Copper(I) chloride, which is water-insoluble).
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Thank you for the information. I will have to look into more solvents like that. 
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JJay
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What size thermometer well do you use for a 24/40 distillation adapter?
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Geocachmaster
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5.5cm looks like the best for the adapter I have. 5 and 6cm would work but would be under and over immersed, respectively. Next to a 10cm well for
comparison.
Edit: I don't think you'll find a well of the right length, my perusing of eBay in the past for correct ones came up with nothing. Perhaps you should
buy a 100mm or 200mm one, break off the excess, and flame the end close. I've never done any work with boro glass but I can't imagine it would be too
difficult to close a tube.
[Edited on 2/12/2017 by Geocachmaster]
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Texium
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| Quote: Originally posted by Sulaiman | I think that the last photo of your blog shows 005.0002 g
005.0 from the digital scale
the zero of the vernier scale on the right is between 00 and 01 of the main scale, so the next two digits are 00
the two scales are coincident at 2 on the vernier scale, the last digit |
Yeah, you're correct. At the time I
wrote that post, I didn't know how to read the final digit, but I looked it up the other day and came to that same conclusion upon reading it again.
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JJay
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| Quote: Originally posted by Geocachmaster | 5.5cm looks like the best for the adapter I have. 5 and 6cm would work but would be under and over immersed, respectively. Next to a 10cm well for
comparison.
Edit: I don't think you'll find a well of the right length, my perusing of eBay in the past for correct ones came up with nothing. Perhaps you should
buy a 100mm or 200mm one, break off the excess, and flame the end close. I've never done any work with boro glass but I can't imagine it would be too
difficult to close a tube.
[Edited on 2/12/2017 by Geocachmaster] |
I see a few sellers with 40mm ones on eBay, but that does seem to be too small except with a 24/29 adapter and 24/40 thermometer well.... I'm pretty
terrible at glassblowing but that might be a good option.
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TheNerdyFarmer
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Question.
Is there a good full proof way to test for nitrites? I made what I believe is sodium nitrite but not sure if it is or not.
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JJay
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It's not foolproof, but a nitrite solution will form a precipitate with silver nitrate and not with lead nitrate.
I think there's a test that can be performed using tincture of iodine as well.
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PHILOU Zrealone
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Azo-dyes are a good way to test for nitrite via diazonium coupling reaction forming colorfull organic dyes.
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
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Magpie
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See p 3 of the "Preparation of ionic nitrites" thread, post of garage chemist.
The single most important condition for a successful synthesis is good mixing - Nicodem
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A Halogenated Substance
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The stopcock of my addition funnel very nearly got stuck but I managed to free with some careful rinsing and turning.
I'd like to prevent this in the future. Would it be wise to add a little glass joint grease to the stopcock every once in a while to prevent this? Are
there more preferable ways to prevent this?
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JJay
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It's best not to use strong bases with glass stopcocks. I do keep my glass stopcocks lightly greased; that could be slightly problematic in some
situation I suppose but seems to be ok most of the time. The problem I often run into is that PTFE has a high coefficient of expansion, so it can be
hard to turn a warm PTFE stopcock.
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Sulaiman
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Quick question: use of salicylic acid
I have 30g pure salicylic acid that I will convert to oil of wintergreen and use on myself medicinally,
after I have done a quick run with a little of the 500g salicylic acid that I bought on a whim because it was cheap (500g = £5 total)
I am considering the synthesis of phenol and benzene, to keep as reagents.
I can't decide how much salicylic acid to keep, how much to convert to phenol and how much to benzene.
1/3 each ?
Which of the three do YOU use most of, and why, please.
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PHILOU Zrealone
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Keep it as salicylic acid...much safer, less volatile and less toxic.
And only when you are ready to make, if ever you make, dérivatives of benzene or phenol, you can effect transformation of some Salicylic acid to
Benzen or Phenol...
If you plan to make trinitrophenol...no need to make phenol first...go straight from SA to TNP via H2SO4/HNO3 nitration.
[Edited on 16-2-2017 by PHILOU Zrealone]
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
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Sulaiman
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As much as I would like to experiment with tri-nitro-XXX and other energetics,
politically, it is not a good time or place - I'm even beginning to worry about potential precursors now 
stupid fucking terrorists - ruining my hobby ... I'm considering declaring jihad on the scum.
I now agree, best to keep as much of the salicylic acid as-is for storage and just use enough for experiments as I go, thanks for the clarity.
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fastbre4k
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It is possible to do an Schmidt reaction in Ethylacetate?
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