34. Titration with phenolphthalein of a mixture consisting of Na2CO3, NaHCO3 and NaCl, weighing 0.4478 g, required 18.80 ml of 0.1998 M HCl solution. When titrating with methyl orange, 40.00 ml of acid solution was consumed for the same sample. Calculate the mass fraction (%) of Na2CO3 and NaHCO3 in the sample.

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