18. When determining iron in wastewater with a volume of 200.0 ml, it was oxidized to trivalent, precipitated with ammonia, separated from the solution, and after dissolving in HCl, titrated with 5.14 ml of 0.005 M EDTA (K = 1.101). Find the total concentration (mg / l of iron in water. Answer: 7.90 mg / l.

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