53. When determining potassium in glass, a 0.5000 g sample of glass was dissolved and transferred to a volumetric flask with a capacity of 250 cm3. Potassium was determined by the addition method. Placed in two volumetric flasks with a capacity of 25 cm3: in the first 20 cm3 of the analyzed solution, in the second – 20 cm3 of the analyzed solution and 0.5 mg of potassium in the form of a standard solution. The level of solutions in volumetric flasks was brought to the mark with distilled water. The intensities of the resulting solutions turned out to be 28 and 46 conventional units. Draw a graph and determine the mass fraction of potassium in glass; solve the problem by calculation.

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