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Author: Subject: blood red ammonium acetate.
copperastic
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[*] posted on 18-4-2014 at 11:00
blood red ammonium acetate.


Hi I prepared an ammonium acetate solution by adding some phenolphthalein solution to the ammonia, Then adding vinegar till the pink went away. I then boiled it down and now the solution is a dark red solution. Do you know why this may be?
Thanks.

It was household vinegar and ammonia.

[Edited on 18-4-2014 by copperastic]




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thesmug
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[*] posted on 18-4-2014 at 11:04


You ended up with an excess of ammonia, which is very common. It probably shouldn't be an issue.
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smaerd
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[*] posted on 18-4-2014 at 11:07


Try adding some cold anhydrous alcohol (ethanol, methanol, isopropanol/whatever) to your 'ammonium acetate'. See if it's the phenolphthalein.

http://en.wikipedia.org/wiki/Phenolphthalein

That's my first guess...




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copperastic
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[*] posted on 18-4-2014 at 11:20


Thesmug, did it make another compound then? If not, why would that color the solution red?



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smaerd
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[*] posted on 18-4-2014 at 11:23


Did you extract or remove the phenolphthalein?



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copperastic
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[*] posted on 18-4-2014 at 11:39


This is what it looked like after being boiled down. When I took it off the hot plate it was fuming white fumes pretty heavily.






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copperastic
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[*] posted on 18-4-2014 at 11:47




Screen shot 2014-04-18 at 2.41.24 PM.png - 851kB




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copperastic
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[*] posted on 18-4-2014 at 11:49


Quote: Originally posted by smaerd  
Did you extract or remove the phenolphthalein?


I didn't do anything to it. That makes me think that some carbon monoxide might've came off from the decomposition of the phenolphthalein.




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smaerd
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[*] posted on 18-4-2014 at 11:51


Looks like some very charred organic material (phenolphthalein).

Sodium acetate should look more like - http://en.wikipedia.org/wiki/File:Ammonium-acetate.JPG





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copperastic
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[*] posted on 18-4-2014 at 12:03


It was ammonium acetate.



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copperastic
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[*] posted on 18-4-2014 at 13:22


Also i added 2 drops of 1 percent solution of phenolphaethlien in isopropanol.
I think I spelled those 2 chemicals wrong...




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thesmug
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[*] posted on 18-4-2014 at 13:46


Isopropanol is right, phenolphthalien, you replaced the th with aeth
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copperastic
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[*] posted on 18-4-2014 at 13:48


That's weird it said isopropanol was spelled wrong.
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[*] posted on 21-4-2014 at 06:10


So why don't you do the experiment again with the amounts that you know for ammonia and vinegar and this time, don't add the phenolphthalien.



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