93. To determine the mass fraction of isopropyl alcohol in a technical product, its 1.5000 g sample was treated with 50.00 cm3 of 1 N. solution of K2CrO7 for 30 minutes in a solution of H2SO4. Then the volume of the solution was brought to 500 cm3, 25.00 was taken and the excess of K2CrO7 was determined iodometrically: KI was added, held for 10 minutes, the released iodine was titrated with 0.1000 M Na2S2O3 solution in the presence of starch. The titration consumed 12.45 cm3 of Na2S2O3. When isopropyl alcohol interacts with K2CrO7, it is oxidized to acetone by reactions ... Determine the mass fraction of isopropyl alcohol and give a conclusion whether this product complies with GOST, if according to GOST the alcohol content should be at least 99.0%.
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