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HCL+KNO3 to make HNO3?


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#21 stsanthony

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Posted 3 January 2006 - 03:24 AM

well, generally, my classmates breaks at least 3 apparatus per month...usually a beaker, a glass rod, together with a conical flask
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#22 [w00t]

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Posted 3 January 2006 - 06:47 AM

and it took about an hour to get rid of all the smoke that was hovering around my basement.


i did that once, 20grams when up in smokes, took nearlly 2 hours for the smoke to clear off, couldnt see much in the kitchen.

looks like i gotta wait till school starts so i can "borrow" glass ware from class.
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#23 [w00t]

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Posted 6 January 2006 - 07:51 AM

Pyrex casserole dishes or glass coffee carafs would work at a push but not recommended.


umm i could be wrong but, Pyrex is actually Borosillicate glass
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#24 YT2095

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Posted 6 January 2006 - 09:06 AM

that`s correct, and your point is?
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#25 [w00t]

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Posted 6 January 2006 - 12:15 PM

then how do u mean it would work at a push and its not recommended
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#26 YT2095

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Posted 6 January 2006 - 12:53 PM

A) people eat and drink from them, so it`s not a good idea.
B) with the exception of the coffee carafe they`re not designed for local heating.
C) because they hold a large amount of liquids, Any problems that occur will be significantly harder to deal with.
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#27 [w00t]

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Posted 14 January 2006 - 02:16 AM

anywho, i got my flask and filled up it up with 46% h2so4 (battery acid) up to 250ml, its been under gas fire heat (bubbling also) for about 1 hour now, but it havent reduced in ammount, or have i noticed "white fumes"
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#28 xelion

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Posted 16 July 2010 - 05:54 PM

hmm... I don't think that'll work considering that both of the reactants are ionic and completely soluble in water. Basically, if you mix the two, you'll just have a solution of H+, Cl-, K+, and NO3- ions floating around so to speak. And I don't think that there's a way to separate both the Cl- AND K+ ions from the solution either. I suppose you could remove the Cl- by adding AgNO3 which would form a solid AgCl which could then be filtered, but I don't think there's an effective way of removing potassium ions.


As a matter of facts, I actually pulled of this exact reaction just the other day. I wanted to make KCl by mixing 30% w/w hydrochloric acid, with solid KNO3. This resulted in an endothermic reaction, producing the ions you also mention in the above postulate (K⁺, Cl⁻, NO3⁻ and H3O⁺).
However, it is possible to seperate the KCl by recrystallization. I reacted 100mL 30% hydrochloric acid with 83g of powdered potassium nitrate, yielding about 45g of crude KCl after crystallization.

I don't know though, what the complete reaction should look like! Under the reaction I found that nitrogen gas was produced as well, but what actually remains in the mother liquid, I don't know...:| Maybe, it is a weak solution of "aqua regia"?

regards

The following reaction occurs, when nitric acid and hydrochloric acid are mixed. This also explains, why aqua regia needs a 1 : 3 molar ratio of HNO3 and HCl.


HNO3 + 3HCl --> ONCl + Cl2 + 2H2O


The precise reaction is much more complex, the equation above only is a net equation.


If you heat a mix of HNO3 and HCl (or KNO3 and HCl), then you'll see that the liquid becomes yellow, or even orange. That yellow/orange color is the color of NOCl. At high concentrations of HCl this is stable. At lower concentrations of HCl it hydrolyses:


ONCl + H2O <--> HNO2 + HCl


Hey! Thanks for this reply dude.. really helped me out a lot! I got to a pale yellow liquid after adding aqeous HCl to KNO3.. I wanted to produce KCl, which I also did.. I used slow heating during the crystallizationprocess.. When combining hydrochloric acid with potassium nitrate, an endothermic reaction occurs, and N2 is released.. as long as no heating is applied, I think you would be in the 'safe zone' here:)

Regards
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#29 bdbstone

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Posted 15 June 2011 - 11:17 PM

Good day. Does anybody know how to clean the KCl after it was cristalized out of the solution? My KCl is pale yellow, since it have HCl and HNO3 contamination a byproduct of mixing HCl and KNO3 and since I am going to use in the further reaction I want to make as clean as possible(or at least without HCl and HNO3).

Thank you.
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