A portion of technical sodium sulfite weighing 0.8840 g was dissolved in water. The volume of the solution was adjusted to 250 ml. To 25 ml of this solution was added 40 ml of 0.05 N. iodine solution. For titration of the resulting mixture, 24.00 ml of 0.05 n. sodium thiosulfate solution. Calculate the mass fraction of Na2SO3 in the sample.

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