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este último está constituido por una mezcla de ácido fosfotúngstico (h3pw12o40) y ácido fosfomolíbdico (h3pmo12o40) que se reduce, por la oxidación de los fenoles, en una mezcla de óxidos azules de tungsteno (w8o23) y de molibdeno (mo8o23).
this reagent is formed from a mixture of phosphotungstic acid (h3pw12o40) and phosphomolybdic acid (h3pmo12o40) which, after oxidation of the phenols, is reduced to a mixture of the blue oxides of tungsten (w8o23) and molybdenum (mo8o23).