4. 200 ml of solution was prepared from technical sodium sulfite weighing 0.5600 g. For titration of 20 ml of solution, 16.20 ml of iodine solution was used, having T (I2 / As2O3) = 0.002473. Determine the mass fraction (%) of Na2SO3 in the sample.

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.