104 Задачка по химии №010 476

After dissolution, 100.0 ml of 0.100 N I2 was added to a sample in 1.500 g of technical Na2SO3. For titration of excess I2, 40.0 ml of a solution was used, 200.0 ml of which contains 2.4820 g of Na2S2O3. Determine the % content of Na2SO3 in the sample.

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