9. The content of H2S in 25 ml of water was determined by electrogenerated iodine. After adding 3.00 g of KI to a 25.0 ml water sample for titration, it was necessary to pass a current of 66.4 mA for 7 min. 25 sec. Calculate the concentration (mg/L) of H2S in the water sample. М(H2S) = 34.08 g/mol.

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