В3.19-1 A standard solution of cerium was prepared by d

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A standard solution of cerium was prepared by dissolving 0.0500 g in 250.0 ml of a mixture of chloric and hydrochloric acid. In flasks with a capacity of 25.00 ml were placed: 2.50, 3.00, 3.50, 4.00, 4.50, 5.00 ml of a standard solution, ammonia, hydrogen peroxide, nitrilotriacetic acid was added and diluted to the mark with water. When photometric with respect to the first solution,
Vst, ml 3.00 3.50 4.00 4.50 5.00
Aotn 0.135 0.270 0.405 0.545 0.680
A sample of lanthanide oxides weighing 0.0500 g was dissolved, the necessary reagents were added, diluted to 25.00 ml and photometricized, as in the construction of the calibration curve. Calculate the mass fraction (%) of CeO2 in a sample of lanthanide oxides according to the following data: Aotn, x = 0.345

Additional information

The task from the textbook on Analytical Chemistry, vol.2, Vasiliev


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