13. A weighed portion of Mohr's salt (m = 4.90 g) was dissolved in a 250.0 ml volumetric flask and an aliquot of 20.0 ml was titrated potentiometrically with a solution of potassium dichromate (С1/6K2Cr2O7) = 0.09958 mol/l). The following data were obtained:
(VK2Cr2O7), ml 5.00 7.50 9.00 9.50 10.00 10.50 11.00 13.00 15.00
E, mV 708 730 757 830 1095 1410 1508 1515
Plot a titration curve and determine the mass fraction of iron in the analyzed sample.

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