123. A sample of the analyzed sample with mass m was dissolved and, after appropriate treatment, titrated with Me2+ titrant R, photometrically. Construct a titration curve and calculate the mass fraction (%) of X in the sample based on the following measurement results (Table 22)
PROBLEM 123
Ме2+ Fe2+
RKMnO4
m, g 0.998
Concentration R T KMnO4/Fe=0.005544
Optical density of the solution after adding the appropriate volume of titrant R, ml 10.0 12.0 14.0 16.0 18.0
0.02 0.02 0.07 0.14 0.20

If the file does not open for you, install the Rar archiver program. Inside the archive, the solution is in WORD format.