Anhydrous acid cannot be obtained by simple evaporation of the water, as the acid ready oxidises to phosphorous acid and phosphoric acid and also disproportionates to phosphorous acid and phosphine. HPA is usually supplied as a 50% aqueous solution.
#Hypophosforus acid sythesis meth free
The salt is then treated with a strong, non-oxidizing acid to give the free hypophosphorous acid: H The acid is prepared industrially via a two step process: Firstly, hypophosphite salts of the alkali and alkaline earth metals result from the reaction of white phosphorus with hot aqueous solution of the appropriate hydroxide, e.g. Hypophosphorous acid was first prepared in 1816 by the French chemist Pierre Louis Dulong (1785–1838).
Sometimes the minor tautomer is called hypophosphorous acid and the major tautomer is called phosphinic acid. HOP(O)H 2 exists in equilibrium with the minor tautomer HP(OH) 2. Salts derived from this acid are called hypophosphites. The formula for this acid is generally written H 3PO 2, but a more descriptive presentation is HOP(O)H 2, which highlights its monoprotic character. It is a colorless high-melting compound, which is soluble in water, dioxane, and alcohols. Hypophosphorous acid ( HPA), or phosphinic acid, is a phosphorusoxyacid and a powerful reducing agent with molecular formula H 3PO 2. Josh Manson has listed (in general terms) the ingredients for what is probably the simplest one, but since pseudoephedrine is a watched chemical, ambitious meth cooks will often start with simpler compounds and pe. Except where otherwise noted, data are given for materials in their standard state (at 25 ☌, 100 kPa).
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