To determine the concentration of SO42- ion in a sample of groundwater, 100.0 mL of the sample is titrated with 0.0250 M Ba(NO3)2, forming insoluble BaSO4. If 4.79 mL of the Ba(NO3)2 solution is required to reach the end point of the titration, what is the (molar) concentration of SO42- in the sample?
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