1. In the process of coulometric titration, Tl is oxidized to Tl3 by electrically generated chlorine. Electrolysis of the solution was carried out at a current of 5 mA. The equivalence point when titrating 4 ml of the analyzed solution was reached in 5 min 10 s. Determine the concentration of thallium ions in the solution (in grams per liter).

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