Sciencemadness Discussion Board

blood red ammonium acetate.

copperastic - 18-4-2014 at 11:00

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]

thesmug - 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.

smaerd - 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...

copperastic - 18-4-2014 at 11:20

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

smaerd - 18-4-2014 at 11:23

Did you extract or remove the phenolphthalein?

copperastic - 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.



copperastic - 18-4-2014 at 11:47



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

copperastic - 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.

smaerd - 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


copperastic - 18-4-2014 at 12:03

It was ammonium acetate.

copperastic - 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...

thesmug - 18-4-2014 at 13:46

Isopropanol is right, phenolphthalien, you replaced the th with aeth

copperastic - 18-4-2014 at 13:48

That's weird it said isopropanol was spelled wrong.

vmelkon - 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.