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47. To prepare a standard solution of zirconium, the sa
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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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