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Author: Subject: Solid sulfuric acid?
DeIonized Plasma
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shocked.gif posted on 15-6-2015 at 20:34
Solid sulfuric acid?


So I was looking at the wikipedia page on sulfuric acid and found this.
xr69IY2.png - 14kB

Has anyone ever made this supposed anhydrous pyrosulfuric acid?




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[*] posted on 16-6-2015 at 01:38


Disulphuric acid H2S2O7 is simply SO3 saturated oleum!
Being a solid @RT it has but few uses . . . ?

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[*] posted on 16-6-2015 at 01:50


http://www.sciencemadness.org/talk/viewthread.php?tid=5495&a...



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[*] posted on 16-6-2015 at 01:52


I wouldn't touch it.
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[*] posted on 16-6-2015 at 02:30


I would!

Here is some solid SO3

And the apparatus that generated it from sodium hydrogen sulphate. note white fumes issuing from drying tube

Just needs sensible precautions as always!

IMG_1146.JPG - 192kBIMG_1796.JPG - 392kB
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[*] posted on 16-6-2015 at 03:02


Ok plastics. You just earned your hazard to others badge!
100th post in classy fashion.
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[*] posted on 16-6-2015 at 10:57


I've made it a couple times, decomposition of a metal sulfate was my method. Using an all glass apparatus and leading the sulfur trioxide into 98% sulfuric acid worked fine, not easy, not practical.



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[*] posted on 16-6-2015 at 10:59


Quote: Originally posted by Molecular Manipulations  
I've made it a couple times, decomposition of a metal sulfate was my method. Using an all glass apparatus and leading the sulfur trioxide into 98% sulfuric acid worked fine, not easy, not practical.


What sort of temperatures are we talking about in order to decompose the metal sulfate? Also, how long does this reaction typically take?

Also, wouldn't you have issues with the glass breaking on cooling with the cake still inside?
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[*] posted on 16-6-2015 at 12:00


I used a quartz tube the second time, and the metal being copper (II) sulfate, the required temperature is only around 550°C, although I used closer to 600°C. I was impatient and didn't wait for the reaction to complete, got only 12% yield (by decomposed sulfate), which took about 30 minutes from the time heat was added to when I turned off the Bunsen. The small quantity of 98% acid and turned to just over 110%, acc. to my acid titration. Which I had calculated to be about 93-95% SO3 absorption (including potential sulfur (VI) reduction by the high temperatures).
The first time I hardly did any analysis of yields and thus have no data.




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[*] posted on 17-6-2015 at 05:23



See the thread in Republications

As per:

http://www.sciencemadness.org/talk/viewthread.php?tid=10332

http://www.sciencemadness.org/talk/viewthread.php?tid=10012

http://www.sciencemadness.org/talk/viewthread.php?tid=5495

[Edited on 18-6-2015 by jock88]
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