499. A mixture of phosphoric acid and sodium chloride weighing 1.5000 g was dissolved in water and 100.0 ml of a solution was obtained. For titration of an aliquot of 10.00 ml was spent in the presence of phenolphthalein 15.66 ml of sodium hydroxide solution with a molar concentration of 0.1637 mol/l. Calculate the mass fraction of phosphoric acid in the mixture in%.

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