I added 10 mL of toothpaste into a beaker and used a F- detecting electrode to take measurments of potential (mV). I used standards to construct a calibration curve and calculated [F-] of toothpaste by the calibration curve. I have the fluoride concentration in ppm ([F-] = 1.919 ppm) now I need to find grams F-. (1ppm = 1ug/mL)
(1.919 ug/mL)(10^-6g/ug)(10ml) = 1.919*10^-5 g
does this look like the correct calculation for determining F- grams from the [F-]?