Sciencemadness Discussion Board

h3po3

AREYNOLDS38 - 4-3-2013 at 23:30

Does anyone have a written procedure for sythnthing h3po3 ? There used to be one on drugs and booze, but the site bas been down. The best i can remember is you use potassium phosphite and boil it in hydrochloric acid then put it in a freezer. Thats all i can remeber. I used to order it from a big chem supplier but it must bave been put o.The watched list or somthing cause they absoloutly wont sell it to me anymore. It works excellant to make HI. ANY HELP WOULD BE APPRECIATED.

woelen - 4-3-2013 at 23:52

Look for alternatives. There are more compounds, which are suitable for making HI.

otc

AREYNOLDS38 - 5-3-2013 at 00:29

Could someone suggest something thats going to be otc ?

blogfast25 - 5-3-2013 at 05:03

Quote: Originally posted by AREYNOLDS38  
Could someone suggest something thats going to be otc ?


'Bone ash', essentially Ca3(PO4)2, plus concentrated H2SO4:

Ca3(PO4)2(s) + 3 H2SO4(l) === > 3 CaSO4(s) + 2 H3PO4(l)

This is 'Ye Olde Way'...

Make your own bone ash by thoughly cleaning chicken bones, drying them and calcining them. Have fun!

AJKOER - 5-3-2013 at 06:42

You can buy TSP (TriSodium Phosphate) at Home Depot. Dissolve TSP in hot water and add Oxalic acid as the Sodium oxalate, Na2C2O4, is not very soluble and falls out of solution (done it):

2 Na3PO4 + 3 H2C2O4.2H2O --> 3 Na2C2O4 (s) + 2 H3PO4 + 6 H2O

The results here would be mostly be more dilute than Blogfast's suggestion (except possibly by heating the mixed dry Na3PO4 and H2C2O4.2H2O)
----------------------------------------------

If you are looking for paths to HI, one recent speculation was that heating dry Oxalic acid dihydrate well mixed with dry NaI, in an environment largely absence air, could generate HI gas. This follows reported observations that a similar reaction with NaCl forms Hydrogen chloride.

The issue is with side reactions, namely the ability of air to decompose Hydrogen iodide into Iodine vapors:

4 HI + O2 --> 2 H2O + 2 I2

but there is another reaction:

I2 + H2C2O4 --> 2 HI + 2 CO2

so Iodine vapors in touch with Oxalic acid (or H2C2O4 vapors) could re-converted the Iodine to Hydrogen iodide. The procedure may also not work for another reason, the reaction is too energetic. So, if interested in investigating, please perform a scaled down test.


[Edited on 5-3-2013 by AJKOER]

ScienceSquirrel - 5-3-2013 at 07:59

He wants to make phosphorous acid, not phosphoric acid

http://en.wikipedia.org/wiki/Phosphorous_acid

http://en.wikipedia.org/wiki/Phosphoric_acid

blogfast25 - 5-3-2013 at 08:34

Quote: Originally posted by ScienceSquirrel  
He wants to make phosphorous acid, not phosphoric acid



Oopsie. My bad. 3 is the magic number.

[Edited on 5-3-2013 by blogfast25]

ScienceSquirrel - 5-3-2013 at 08:56

That's OK.
Phosphoric acid is widely available as it is used for yeast washing in brewing, pH down in hydroponic systems, iron descaling, etc.
Mr Reynolds wants phosphorous acid for a spot of meth cooking ;)

blogfast25 - 5-3-2013 at 08:59

Quote: Originally posted by ScienceSquirrel  
That's OK.
Phosphoric acid is widely available as it is used for yeast washing in brewing, pH down in hydroponic systems, iron descaling, etc.
Mr Reynolds wants phosphorous acid for a spot of meth cooking ;)


What's it do in meth cooking?

Bot0nist - 5-3-2013 at 09:28

I believe it is used for the "in situ" regeneration of HI in a psuedo to meth cooking tek. I know very little to nothing about that chemistry, or mechanism, i admit though. so I could be wrong.

Metacelsus - 5-3-2013 at 11:18

Is there any way to reduce phosphoric acid to phosphorous acid? (Electrolysis comes to mind.) If so, it might be a good way to get phosphorous acid given the easy availability of phosphoric acid.

Doc B - 6-3-2013 at 03:18

Will phosphoric acid regenerate HI from I2 spent on deoxygenating the benzyl alcohol, just the same as phosphorous acid?

Prometheus23 - 6-3-2013 at 03:34

No, phosphoric acid will not generate hydroiodic acid from elemental iodine, because phosphoric acid is not a reducing agent.