81. In a volumetric flask with a capacity of 500 cm3, 10 cm3 of a mixture of commercial sulfuric and phosphoric acids were dissolved, 25 cm3 of this solution was titrated with 26.40 cm3 of NaOH solution with a titer of TNaOH / HCl = 0.003600 g/cm3 according to methyl orange. The same sample was titrated against phenolphthalein with 40 cm3 of NaOH solution. How many grams of H2SO4 and H3PO4 were contained in 1 dm3 of the mixture?

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