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Help plz. A groundwater sample contains 2.000mg/L of iron as Fe3+. What pH is required to precipitate all but 0.500mg/L of the iron at 25C

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A groundwater sample contains 2.000mg/L of iron as Fe3+. What pH is required to precipitate all but 0.500mg/L of the iron at 25C ? Respond with 2 decimal places

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