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Author: Subject: iS 99% KNO3 fine for most reactions?
Db33
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[*] posted on 4-4-2017 at 05:39
iS 99% KNO3 fine for most reactions?


so today i got a pound of Gordons Stump Remover cuz it was only $8 and i knew it was 99% KNO3 and 1% Calcium Stearate. IS there a way to remove that or is that fine for most reactions?
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Herr Haber
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[*] posted on 4-4-2017 at 05:56


I have used 99% KNO3 with (SiO2) anticaking and without.
I havent noticed the slightest difference.

I guess it depends on your use.
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[*] posted on 4-4-2017 at 06:15


Quote: Originally posted by Db33  
IS there a way to remove that or is that fine for most reactions?

Recrystallization. Calcium stearate is barely soluble in water.




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[*] posted on 4-4-2017 at 07:51


It should be fine, I've used that in the past and works well enough, as long as it's over 90% you should be fine.



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[*] posted on 4-4-2017 at 10:36


I have used stump remover KNO3 that had some kind of oily coating, possibly it was Ca stearate. This was the least satisfactory KNO3 that I have used. The pottery grade is much better. I would try to remove that stearate: perhaps by washing with an organic solvent. Or use recrystalization.



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Db33
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[*] posted on 4-4-2017 at 11:56


The kind i have is just white prills that dont have a coating and seems really pure to me
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[*] posted on 5-4-2017 at 04:07


That should work as longs as its is property ground up. It need to be in a somewhat fine powder or better. (To get best results)



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XeonTheMGPony
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[*] posted on 5-4-2017 at 05:09


Sorry to borrow on your thread but seems a good injection point, I see no reason why HCL could not be used for making of nitric acid to end with the chloride salt. Or am I missing some thing obvious, I all ready factored int he water as the goal is Azeotropic HNO3
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Tsjerk
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[*] posted on 5-4-2017 at 06:01


Look up Nitrosyl Chloride
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XeonTheMGPony
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[*] posted on 5-4-2017 at 10:54


figured there was a "gotcha" some where in my reasoning, thanks.
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[*] posted on 5-4-2017 at 10:58


Also, hydrochloric acid is volatile, or at least it is more volatile than sulfuric acid.

[Edited on 5-4-2017 by JJay]




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[*] posted on 6-4-2017 at 09:14


99% Purity should be fine for most reactions, although if your experiment is very sensitive you can purify the KNO3 via recystilazation, Calcium stearate is extremely insoluable in cold water.
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