30. Solving a chemistry problem

3. A portion of the ore weighing 1.0389 g was dissolved and, after appropriate treatment, Fe2+ ions were titrated with a solution of potassium permanganate by the photometric method. Construct a titration curve and calculate the mass fraction (%) of iron in the sample from the following measurement results С(КМnO4)= 0.1075 mol/l
Vml 10.00 12.00 14.00 16.00 18.00 20.00
0.010 0.010 0.010 0.050 0.100 0.150