17. For analysis, a weighed portion of ore (m=0.1016 g) was taken and dissolved, uranium was converted to uranium (IV) and titrated potentiometrically with a solution of potassium permanganate C(1/5KMnO4)=0.01046 mol/l. The following data were obtained:
V(KMnO4), 5.00 10.00 15.00 17.50 18.00 18.50 20.00
E, mV 305 325 346 370 1170 1495 1506
Plot a titration curve and determine the mass fraction of uranium in the ore. Reaction equation scheme: U4 Mn4-=UO22 Mn2

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