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A sample of toothpaste was analyzed for its fluoride content by treating a 250 mg sample with an ionic strength buffer to extract F- followed by...

A sample of toothpaste was analyzed for its fluoride content by treating a 250 mg sample
with an ionic strength buffer to extract F- followed by dilution to 100.0 mL. The potential
reading with a fluoride ISE was +150.3 mV. After addition of 10.0 mL of a 50.0 ppm Fstandard,
the potential reading became +110.8 mV. Assuming a slope of –58.0 mV for the
fluoride ISE, calculate the fluoride content of the toothpaste in %NaF.

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