37. A weighing of technical Na2SO3 weighing 0.4680 g was added to 100 ml of a 0.1000 N solution of I2 (feq (I2) = 1/2). The excess of iodine was titrated with 42.40 ml of Na2S2O3 solution having T(Na2S2O3/Cu)=0.006215. Calculate the mass fraction (%) of Na2SO3 in the sample. Answer: 80.53%.

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