138. Solving a chemistry problem
100. To determine the iodine number, which shows how many milligrams of I2 is added to 1,000 g of oil, a weighed portion of 1.3350 g of sunflower oil was dissolved in alcohol and mixed with 25.00 cm3 of the working iodine solution. For the titration of the residue that did not react with iodine, 7.30 cm3 of 0.1000 M Na2S2O3 solution was consumed. 25.00 cm3 of iodine solution is reacted with 20.90 cm3 of sodium thiosulfate. Calculate the iodine value of a sample of sunflower oil.
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