146. Задачка по химии №014 5818

47. To prepare a standard solution of zirconium, the sample of ZrOCl2 * 8H2O with a mass of 0.3533 g was dissolved in 100.0 ml of hydrochloric acid. A volumetric flask with a capacity of 50.00 ml was placed 1.00; 1.20; 1.50; 1.70; 2.00 ml of a standard solution, gallocyanin MS (zirconin) was added and brought to the mark with water. Optical densities relative to the first solution were measured. The values ​​of Aotn for the second, third, fourth and fifth solutions were respectively: 0.100; 0.235; 0.330; 0.470. A sample of zirconium alloy weighing 0.1120 g was dissolved in 100.0 ml of a mixture of acids. An aliquot of 2.00 ml was taken into a volumetric flask with a capacity of 50.00 ml, zirconin added and brought to the mark. Measured the optical relative density of Aot.x as in the construction of the calibration curve.
Calculate the mass fraction (%) of zirconium in the alloy.
Task variant 1
Aot.x = 0.320

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