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Author: Subject: Method For Drying Mg(No3)2
Fashist
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[*] posted on 30-1-2008 at 03:48
Method For Drying Mg(No3)2


Any body Know Simple Method For Drying Mg(No3)2 ?
and Anybody know how we can increase the concentration of nitric acid using mg(no3)2 ?
thx
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PHILOU Zrealone
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[*] posted on 30-1-2008 at 03:57


I don't know if it belongs to the Organic chemistry forum; maybe must it be displaced in another folder.

One of my friends used to do it.

Heating arround 200°C in the open until it becomes a smooth powder.
Adding the HNO3 (69%).

Distillation at normal pressure provide red CNA (concentrated nitric acid).

Distillation under reduced pressure with cold trap, provide white CNA.

[Edited on 30-1-2008 by PHILOU Zrealone]

[Edited on 30-1-2008 by PHILOU Zrealone]




PH Z (PHILOU Zrealone)

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[*] posted on 30-1-2008 at 09:44


Red CNA versa white CNA? Wasn't it RFNA and WFNA? WTF nitric acid???

Have you done it this way? My first thought was to simply add the Mg nitrate to conc sulfuric, then distill (no vacuum with AN, don't know here). Perhaps after *some* drying to get part of the water of crystallization out? Or would you need too much acid to keep it stirable (AN dissolves completely), dried or not? I bet the Mg sulfate won't stay dissolved no matter what ...
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vulture
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[*] posted on 30-1-2008 at 15:20


No, no, the magnesium nitrate is the drying agent instead of sulfuric acid here, not the reagens which is used to produce HNO3 by displacement.

Using Mg(NO3)2 and the DCM extraction process you can do without sulfuric acid and regenerate your Mg(NO3)2 without much trouble (as opposed to regenerating sulfuric acid).

***Moved to general chemistry***

[Edited on 31-1-2008 by vulture]




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jokull
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[*] posted on 31-1-2008 at 13:47


I have some doubts about your Mg(NO3)2, is it the hexahydrated form (the most common), or which one?, and how pure do you want it?

I know that is a highly higroscopic salt, so in order to obtain the anhydrous form it is necessry to use special drying techniques such as pulse combustion but it applies to large quantities. (I've attached a concerning patent for some ideas)

If you want to dry a few grams, you can try with a simple microwave oven. I have dried some solids before that way, 15 to 30 seconds at medium power works well.

Attachment: WO2007012951.pdf (451kB)
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[*] posted on 1-2-2008 at 01:12


I made Mg(no3)2 before(MGCO3+HNO3).
I made nitric acid from an+h2so4 before but i want to try this method
i use mg(no3)2.6h2o and i want to dry it(using oven.about 200c)
thx
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jokull
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[*] posted on 1-2-2008 at 15:15


Ok.

With the oven you can get a mix of anhydrous and dihydrated magnesium nitrate, it occurs because they form a simple eutectic system with a eutectic point at 129°C and 82 % Mg(NO3)2 (18% water).

So once you have reached the right temperature you will need to avoid the contact between Mg(NO3)2 and water (from air) during its cooling.
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