Opt51-2 standard solution Prepare a solution of cerium

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51. Option 2
The standard solution was prepared by dissolving cerium 0.0500 g in 250.0 ml of perchloric acid and hydrochloric acid. The flasks were placed 25.00 ml: 2.50; 3.00; 3.50; 4.00; 4.50; 5.00 ml of standard solution was added ammonia, hydrogen peroxide, nitrilotriacetic acid, and diluted to the mark with water. With respect to the first photometric solution obtained:
Vst, 3.00 ml; 3.50; 4.00; 4.50; 5.00
Aotn 0.135 0.270 0.405 0.545 0.680
A portion of the lanthanide oxides weighing 0.0500 g was dissolved, add the required reagents, diluted to 25.00 mL and photometrically, as in the construction of the calibration curve.
Calculate the mass fraction of lanthanide oxides in the sample on the following data.
Aotn.h = 0.440

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