136. Задачка по химии №013 625

For analysis, 20.00 cm3 of waste water containing iron compounds was taken, oxidized to iron (III) and precipitated in the form of hydroxide. The washed precipitate was dissolved in hydrochloric acid and titrated with 4.05 cm3 of a 0.0505 M complexone III solution. Calculate the mass concentration of iron in wastewater in mg/dm3.

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