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6 g soil sample was treated with HClO4 and HF was distilled from the mixture. The HF distillate was then diluted to a volume of 50.

A 3.6 g soil sample was treated with HClO4 and HF was distilled from the mixture. The HF
distillate was then diluted to a volume of 50.0 mL. Measurement with a fluoride ISE
resulted in a potential of +95 mV. Exactly 5.00 mL of 1 x 10-3 M F- standard was added to
the 50.0 mL solution and the potential on the fluoride ISE became +68 mV. Calculate the
fluoride content in the soil as %F-.

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