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#Post#: 1087--------------------------------------------------
Potassium tetraoxalate dihydrate
DIR By: rasool083
Date: November 10, 2012, 6:28 am
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Hello,
who know the production of "Potassium tetraoxalate dihydrate"
[KH3(C2O4)2.2H2O] or [KHC2O4·H2C2O4·2H2O]
Thanks
#Post#: 1129--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: Michel
Date: November 15, 2012, 8:23 am
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Have you tried looking up some patents for this synthesis?
#Post#: 1134--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: rasool083
Date: November 16, 2012, 10:48 pm
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yes.
but I dont find any thing.
#Post#: 1151--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: Shiva
Date: November 18, 2012, 2:47 am
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Sorry for the delay in getting back to you. I was not doing
well. Well, this can be prepared by the same method (potassium
hydroxide + Oxalic acid) bioxalate is prepared. But, not sure at
what temperature the poorly soluble tetraoxalate is formed. I
will try this for you and let you know.
Thanks,
Shiva
#Post#: 1153--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: Shiva
Date: November 18, 2012, 5:11 am
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Okay, here is the product. Seems, it contains both the mixture
of Potassium bioxalate and tetraoxalate as the solution is
little cloudy. The tetraoxalate may precipitate on cooling.
Let's see.
Shiva
#Post#: 1157--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: rasool083
Date: November 19, 2012, 3:52 am
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hi
thanks
I need the large grain of potassium tetraoxalate dihydrate only.
which is better?
1. oxalic acid + potassium carbonate + water
2. oxalic acid + potassium hydroxide + water
#Post#: 1158--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: Shiva
Date: November 19, 2012, 4:04 am
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Well, I do not have Potassium carbonate to test it. But most
probably, it will react the same way. It seems the formation of
Potassium tetraoxalate mainly depends on accurate titration and
temperature. Please give me a day or two and I will come back
with a solution.
Thanks,
Shiva
#Post#: 1252--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: rasool083
Date: November 27, 2012, 4:22 am
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I try it with potassium carbonate and I can get it.
the problem is the grain size.
how could I have large crystals?
#Post#: 1253--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: Shiva
Date: November 27, 2012, 4:32 am
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Sorry Rasool, I was busy and did not have much time for this.
That's really cool. Normally, Alkali & alkaline earth metal
salts do not form big crystals. However, some do form crystals
in reasonable size when they are exposed to air now and then
especially if they are not extremely deliquescent.
#Post#: 1277--------------------------------------------------
Re: Potassium tetraoxalate dihydrate
DIR By: Michel
Date: November 28, 2012, 9:09 am
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I know that it's possible to obtain larger crystals by cooling
the solution slowly..so likely you'll obtain the large crystals
by cooling the solution very slowly?...
Or have you already tried this?
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