During the coulometric titration of 5.00 ml of a potassium dichromate solution in a strongly acidic medium, to reduce the dichromate ion with an electrogenerated iron(II) ion, it was necessary to pass a current of 20.0 mA for 6 min 15 s. Determine the molar concentration of the potassium dichromate equivalent in the analyzed solution. Answer: 0.0155 mol/l.

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