12. A sample of steel weighing 1.43 g was dissolved, iron was oxidized to Fe (II) and titrated potentiometrically with a solution of potassium permanganate. The following data were obtained: С(1/5 KMnO4)=0.001046 mol/l.
V(KMnO4), ml 5.00 10.00 15.00 19.00 19.50 20.00 20.50 21.00 23.00
E, mV 713 774 805 840 886 1107 1345 1370 1395
Build a titration curve, find the potential and volume of potassium permanganate at the equivalence point, calculate the mass fraction of iron in the analyzed sample.

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.