0730. Solving a chemistry problem

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• About 0.1 g (exactly weighed) of glucose substance is placed in a 50 ml volumetric flask (solution A). 5 ml of solution A is transferred to a titration flask, 5 ml of 0.1 mol/l iodine solution (I2) and 7.5 ml of 0.1 mol/l sodium hydroxide (NaOH) solution are added. The flask is closed and left for 20 minutes in a dark place. After the specified time, 5 ml of dilute sulfuric acid (H2SO4) is added to the flask and titrated with 0.1 mol/l sodium thiosulfate solution (Na2S2O3). The indicator is starch.

At the same time, a control experiment is carried out. Place 5 ml of purified water, 5 ml of 0.1 mol/l iodine solution (I2) and 7.5 ml of 0.1 mol/l sodium hydroxide solution (NaOH) into a titration flask. The flask is closed and left for 20 minutes in a dark place. After the specified time, 5 ml of dilute sulfuric acid (H2SO4) is added to the flask and titrated with 0.1 mol/l sodium thiosulfate solution (Na2S2O3). The indicator is starch.

Write the chemistry, calculate the equivalence factor, molar mass of the equivalent, titer and write a formula for calculating the mass fraction of the drug as a percentage.

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