When measured with a F - ion-selective electrode with a Nernstian response at 25C, the potential due

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When measured with a F- ion-selective electrode with a Nernstian response at 25°C, the potential due to F- in unfluoridated groundwater in Foxboro, Massachusetts, was 40.0 mV more positive than the potential of tap water in Providence, Rhode Island. Providence maintains its fluoridated water at the recommended level of 1.00 ± 0.05 mg F-/L. What is the concentration of F- in mg/L in groundwater in Foxboro? (Disregard the uncertainty.)

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