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Topic: Making Sulfuric Acid  (Read 34669 times)

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Offline woelen

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Re:Making Sulfuric Acid
« Reply #15 on: September 22, 2005, 05:05:30 AM »
Quote
far as oxidising what do you supose would happen if you bubled realy cold (like -240 c) so2 through liquid o2 or better yet just burned straight sulfur in a presurized container filled with o3 (ozone if i remember correctly)
PLEASE!!!! Read your books and do some real chemistry >:(.
What do think SO2 will be at -240C? As solid as a rock!
Container with pressurized O3? I would not like to be near such a beast! Most likely this means instant explosion!
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Re:Making Sulfuric Acid
« Reply #16 on: September 23, 2005, 12:36:08 AM »
Picric acid is a somewhat high molecular weight organic acid.  By default it is a crystal at room temperature and pressures.  Sulfuric acid is a 'mineral acid' and is a liquid in its pure form and standard temperature and pressure.  'Boiling sulfuric acid and rapidly freezing it' won't form crystals.  Sulfuric acid is not a crystalline compound.

true, didnt think of it that way. water is liquid naturaly as well but does form crystals (not ice) it happens near thermal vents at bottom of oceans where the water wants to boil but cant cause of pressure i saw something bout that on science channel once so there must be someway of crystilizing sulfuric acid although i have no idea why you would want to. maybe if you added something to it but then again you wouldnt exatcly have sulfuric acid crystals but something like sulfuric acidized crystals of something  else.just plaz tell me i'mwrong would hate to see some poor fool manage to crystalize sulfuric acid then mistake it for salt at a later date

Offline Borek

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Re:Making Sulfuric Acid
« Reply #17 on: September 23, 2005, 04:01:57 AM »
Sulfuric acid is a 'mineral acid' and is a liquid in its pure form and standard temperature and pressure.

Melting point 10.36 C.
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Offline gregpawin

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Re:Making Sulfuric Acid
« Reply #18 on: September 24, 2005, 06:24:13 AM »
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Offline limpet chicken

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Re:Making Sulfuric Acid
« Reply #19 on: September 24, 2005, 08:22:26 AM »
I believe the arabs made sulfuric acid, by pyrolysing ferrous sulfate in large clay retorts, and once it decoposes to SO3, leading it through dilute sulfuric acid.

With modern glassware, the SO3 could indeed be crystallised, by passing it into a flask, immersed in a freezing mixture such as ice/salt.
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Offline hmx9123

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Re:Making Sulfuric Acid
« Reply #20 on: September 28, 2005, 03:33:40 PM »
Problem with SO3 is that it polymerizes under a certain temperature.

Offline P-man

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Re:Making Sulfuric Acid
« Reply #21 on: September 28, 2005, 08:55:49 PM »
Yeah, that relly sucks. Trust me.  ::)
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Taaie-Neuskoek

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Re:Making Sulfuric Acid
« Reply #22 on: September 30, 2005, 04:52:33 AM »
Problem with SO3 is that it polymerizes under a certain temperature.

Do you have more info on this? I recently made a bit SO3 from (HPO3)n and H2SO4, and it was a crystalline solid, does is also polymerise in that form, or only when it's liquid? Does oleum do the same? Otherwise one can add the SO3 carefully to conc H2SO4, and distill it off later when needed...

Offline woelen

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Re:Making Sulfuric Acid
« Reply #23 on: September 30, 2005, 07:20:56 AM »
SO3 indeed can polymerize. In fact it is one of the few non-element forms, which has different allotropic forms. SO3 forms (SO3)2 and (SO3)3. But these still are as reactive and dehydrating as SO3, so don't worry when it polymerizes that you are left with some dead dull glass-like stuff ;D.
SO3 in oleum may also show this behavior, but I'm not sure about that. The polymerization of SO3, however, is of a totally different nature than that of e.g. HPO3. You should not be afraid that you get some hard and inert stuff.

So, P-man, I do not see why this polymerization sucks  ???.
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Offline P-man

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Re:Making Sulfuric Acid
« Reply #24 on: September 30, 2005, 11:19:37 AM »
Well last time I tried to stop it from polymerizing.
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