9. Weighed sample, consisting of a mixture of Na2CO3 and NaHCO3, weighing 1.500 g, was dissolved in a volumetric flask with a volume of 250.0 ml. For titration of 50.00 ml of the resulting solution with phenolphthalein, 5.70 ml of a 0.2000 M HCl solution were used. For further titration of the same solution with methyl orange, 20.80 ml of a 0.2000 M HCl solution were used. Calculate the mass fraction of Na2CO3 and NaHCO3 in the analyzed sample.

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