5.1 A sample of steel weighing 1.1998 g was dissolved, iron was transferred to Fe (II) and titrated potentiometrically with 1 M Ce (SO4) 2. Construct a titration curve in the coordinates ΔE / ΔV - V and calculate the mass fraction (%) of iron in the alloy according to:
V(Ce(SO4)2), ml 2.00 10.00 18.00 19.80 20.00 20.20 22.00
E, mV 712 771 830 889 1110 1330 1390

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