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Topic: Unknown chemical  (Read 3978 times)

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Offline oyooz123

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Unknown chemical
« on: June 12, 2011, 03:37:38 PM »
Hello,

I have to figure out what my unknown chemical is and i have some information, but i have no idea what my chemical is. Here is some test results for it.

- Soluble in Water, insoluble in acetone and ethanol
- Pink Aqueous solution
- pink aqueous solution clears up when hcl is added (gas forms, pretty sure its odorless)
- pink aqueous solution clears up when Naoh is added
- Lime water + unknown = precipitate (white) , so possibly a carbonate or bicarbonate
- unknown chemical flame test = bright lavender/blue/purple flame (so maybe potassium compound)

What I cannot figure out is why my chemical aqueous solution is light pink in color.....What could be causing that.
This is all I have for tests so far. Any help would be appreciated
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Offline oyooz123

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Re: Unknown chemical
« Reply #1 on: June 12, 2011, 05:38:03 PM »
This chemical could also be a hydrate in case anyone was wondering.

PLEASE HELP
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Offline BluePill

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Re: Unknown chemical
« Reply #2 on: June 13, 2011, 01:07:09 AM »
could K2CO3. It is pink because of phenolphthalein.
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Offline Borek

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Re: Unknown chemical
« Reply #3 on: June 13, 2011, 04:03:21 AM »
Quote from: BluePill on June 13, 2011, 01:07:09 AM
could K2CO3. It is pink because of phenolphthalein.

So why it stops to be pink after adding NaOH?
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Offline vmelkon

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Re: Unknown chemical
« Reply #4 on: June 14, 2011, 07:06:15 PM »
So you add Ca(OH)2 and you get a white precipitate?
Does the solution remain pink?
That would mean the cation is pink.
You add NaOH and no precipitate?

How many elements have a pink cation and also have a hydroxide that dissolves in water? I don't know.

Are we talking about inorganic or organic chemistry?
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Offline oyooz123

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Re: Unknown chemical
« Reply #5 on: June 14, 2011, 07:59:53 PM »
figured it out nevermind
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Offline BluePill

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Re: Unknown chemical
« Reply #6 on: June 19, 2011, 12:58:21 AM »
Oops, sorry Borek, my bad.

KMnO4, I guess.
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Offline vmelkon

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Re: Unknown chemical
« Reply #7 on: June 21, 2011, 02:23:02 AM »
so what is this mysterious chemical?
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