481. When analyzing a sample of industrial wastewater with a volume of 100.0 ml, sulfate ions were precipitated with a solution of barium chloride, the precipitate of barium sulfate was filtered, washed and dissolved in 30.00 ml of a 0.025 M EDTA solution (K = 1.001). Determine the concentration of sulfate ions in the wastewater sample (mg/l).

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