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Author: Subject: Rust stain remover H3PO4
madscientist
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[*] posted on 6-8-2002 at 11:10
Rust stain remover H3PO4

Does anyone know the concentration of the "rust stain remover" type H3PO4 that is found at hardware stores?



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[*] posted on 6-8-2002 at 21:40


My H3PO4 is a thick, syrupy liquid. According to my references, H3PO4 that is a thick, syrupy liquid is at about 85% concentration.



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[*] posted on 20-8-2002 at 08:56


The maximum I've seen is 30%.
85% H3PO4 is extremely hygroscopic, see if it will dry NH4NO3.

Since I have 2L of the 85% stuff I might very well build a dessicator one day.



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Ramiel
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[*] posted on 5-9-2002 at 01:02
Just a thought...

I know concentrated Phosphoric acid of a known molarity can be obtained from food suppliers.
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[*] posted on 16-9-2002 at 06:32


Yeah, it is used in our daily coke as acidifiant; the trucks used to transport concentrated coke syrup are labeled as "corrosive" ! And a nail will be VERY coroded if kept for 3 days in coke.
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[*] posted on 17-9-2002 at 00:52


I heard that it dissolves a T-Bone steak overnight.... although that's what the dentists tell you.
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[*] posted on 14-9-2015 at 21:42


How do you turn phosphorus acid crystals into a liquid similar to 50% hypo phosphorous acid?
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[*] posted on 16-9-2015 at 10:13


I dunno what hypophosphorous acid looks like, never seen a specimen. But to turn solid phosphoric acid into a liquid, just add water.



Smells like ammonia....
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