5. A portion of salicylate sodium (E=160) weighing 0.8606 g was dissolved in a volumetric flask with a capacity of 30.00 ml and the solution was brought to the mark with glacial acetic acid. Potentiometric titration of 3.00 ml of the resulting 0.1 M HCO4 solution gave the following data:
V, ml 4.0 4.2 4.4 4.0 4.8 5.0 5.2 5.4
E, mV 440 447 458 474 512 595 615 625
Calculate the mass fraction (%) of indifferent impurities in the preparation.

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