47 (2). To prepare a standard zirconium solution, weigh

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47 (2). To prepare a standard zirconium solution, weighed ZrOCl2 * 8H2O weighing 0.1242 g was dissolved in 100.0 ml of hydrochloric acid. In a volumetric flask with a capacity of 50.00 ml was placed 1.00; 1.20; 1.50; 1.70; 2.00 ml of the standard solution, added gallocyanin MC (zirconin) and adjusted to the mark with water. Measured optical density relative to the first solution. We obtained the Aot values ​​for the second, third, fourth, and fifth solutions, respectively: 0.100; 0.235; 0.330; 0.470. A portion of a zirconium alloy weighing 0.1120 g was dissolved in 100.0 ml of a mixture of acids. In a measuring flask with a capacity of 50.00 ml, an aliquot of 2.00 ml was taken, zirconin was added and brought to the mark. Measured optical relative density Анн.х as in the construction of the calibration curve.
Calculate the mass fraction (%) of zirconium in the alloy.
Option 2
Aoth. X = 0,380

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