2. After dissolution, 100.0 ml of 0.1000 N iodine solution were added to a 1.500 g sample of technical sodium sulfide. 40.0 ml of the solution were used to titrate the excess Ј2; 200.0 ml of the solution contained 2.4820 g of sodium thiosulfate. Determine the % Na2SO3 content in the sample.
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