Amy Winehouse
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Posts: 44
Registered: 4-10-2011
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Mood: Saucy
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Appropriate vacuum trap
Hey everyone, I have a question:
I need to distill the water off of a slightly acidic solution (a small amount of hcl in it). I don't want to mess up my metal vacuum pump. An
aspirator won't pull a vacuum strong enough for my purposes. My question is how I could use NaOH to set up a trap. My idea:
Fill a drying tube with dry NaOH and place it between the distillation setup and my vacuum.
The traps i've seen that sigma-aldrich sell do something similar to this, but they use KOH, which begs the question:
Will dry HCl gas react with dry NaOH? I can't assume there will be humidity, but is humidity even necessary? If i had an ideally anhydrous hcl gas and
passed it over dry NaOH in an ideally dry environment will it react?
HCl(g)+NaOH(s)---> H2O(g)+NaCl(s)?
HCl(g)+NaOH(s)---> H2O(l)+NaCl(s or aq)
Hcl(g)+NaOH(s)--->jack shit?
Thanks all =]
"I'm too drunk to taste this chicken"
-Colonel Sanders
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sargent1015
Hazard to Others
Posts: 315
Registered: 30-4-2012
Location: WI
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Mood: Relaxed
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KOH or NaOH, same thing in this case. Water will be produced so this seems like a good idea. Do you have a way to increase the contact surface of the
NaOH with the gas? You want to make sure that it is entirely "washed" before it reaches your pump!
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