23. When analyzing a sample of waste water with a volume of 100.0 ml for the content of sulfate ions, they were precipitated with a solution of barium chloride. The barium sulfate precipitate was filtered off, washed and dissolved in 30.00 ml of 0.0250M EDTA solution. The excess of EDTA was titrated using 15.00 ml of 0.0250M magnesium chloride solution. Calculate the concentration of sulfate ions (mg/ml) in the sample. Mol. mass (SO4) 96.07.

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