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Topic: Concentrating 33% H2SO4  (Read 5936 times)

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Offline Eddie Zheng

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Concentrating 33% H2SO4
« on: May 03, 2011, 07:15:02 PM »
Hello I need help on concentrating battery grade (Around 33%) H2SO4 as I need it for one of the steps on making dilute HNO3. I have the things I think I need. I want it to be safe, easy (can be a little challenging) and using not many super sophisticated pieces of glassware.
Thanks!
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Offline Maverick

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Re: Concentrating 33% H2SO4
« Reply #1 on: May 03, 2011, 10:25:53 PM »
hot plate + beaker and boil it down thats how i did it
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Offline AWK

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Re: Concentrating 33% H2SO4
« Reply #2 on: May 04, 2011, 02:54:53 AM »
Dilute HNO3 can be obtained without concentration of this acid
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Offline Eddie Zheng

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Re: Concentrating 33% H2SO4
« Reply #3 on: May 06, 2011, 06:44:38 PM »
Thanks for the concentration tips... ;D
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Offline Maverick

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Re: Concentrating 33% H2SO4
« Reply #4 on: May 07, 2011, 12:10:01 AM »
no problem mate but instead of going through that hassle just look for rooto liquid drain opener its very concentrated ive titrated my previous purchases of it to be ~18 M
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Offline Eddie Zheng

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Re: Concentrating 33% H2SO4
« Reply #5 on: May 07, 2011, 12:47:40 AM »
yah Ive been trying to look out for that, noluck. Even in Ace, or lowes i cant find it...
This is the city! :P
::)
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Offline svarc

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Re: Concentrating 33% H2SO4
« Reply #6 on: May 14, 2011, 05:25:46 PM »
Eddie here is more info about Maverick suggestion.
H2O boiling point is 100°C
H2SO4 boiling point is 337 °C
So water will evaporate first and then sulfuric acid.
There are 2 ways to know where to stop boiling:
1) measure volume ex. if you have 33% sulfuric acid then if you are boiling 100ml then stop when approximately 67ml boils off.
2) measure the temperature of the liquid while boiling and stop when temp is rising above 100°C.
I know you figure out this but i write just in case... :)
BTW don't use it to nitrate glycerin its too messy :)
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Offline Eddie Zheng

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Re: Concentrating 33% H2SO4
« Reply #7 on: May 17, 2011, 08:42:39 PM »
why thank you! Very well explained and i now know what to do exactly! ;) :D
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Offline TheUnfocusedOne

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Re: Concentrating 33% H2SO4
« Reply #8 on: May 18, 2011, 02:04:51 PM »
You should probably due this in a hood. Sorry if that's an un needed statement, just wanted to make sure someone said it just incase you weren't aware.
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Offline 408

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Re: Concentrating 33% H2SO4
« Reply #9 on: May 18, 2011, 02:42:47 PM »
This definitely needs a hood!  As you get near 100% H2SO4 white chocking fumes will be produced that are rather corrosive and toxic....
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Offline Eddie Zheng

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Re: Concentrating 33% H2SO4
« Reply #10 on: May 18, 2011, 06:53:16 PM »
ok, thanks because i was about 2 do it wthout a hood! :o
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Offline Borek

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Re: Concentrating 33% H2SO4
« Reply #11 on: May 19, 2011, 03:51:47 AM »
Which is a reason why this thread gets locked.

Don't touch things you have no idea about.
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