5.1g of toothpaste was weighed out and transferred to a 500 ml beaker. 250 ml of deionized water was added to the beaker by measuring cylinder, heated for 5 minutes on a hotplate, then sonicated for 10 minutes in an ultrasonic bath. The contents of the beaker was then transferred to a 1000 ml volumetric flask, made to the mark with deionized water and mixed thoroughly. 10 ml of this solution was removed from the volumetric flask (autopipette), 5 ml (measuring cylinder) of TISAB buffer was added. From the calibration curve of potential difference (mV) vs log[F-] equation, y = -56.21x - 151.71, the mean of [F-] is 1.81E-04 and the concentration in mgF-/L is 3.4. The expected Fluoride in toothpaste according to toothpaste manufacturer: 1000 ppm Fluoride. So how do i calculate the % of F in the toothpaste sample?
5.1g of toothpaste was weighed out and transferred to a 500 ml beaker. 250 ml of deionized water was added to the beaker by measuring cylinder, heated for 5 minutes on a hotplate, then sonicated for 10 minutes in an ultrasonic bath. The contents of the beaker was then transferred to a 1000 ml volumetric flask, made to the mark with deionized water and mixed thoroughly. 10 ml of this solution was removed from the volumetric flask (autopipette), 5 ml (measuring cylinder) of TISAB buffer was added.
From the calibration curve of potential difference (mV) vs log[F-] equation, y = -56.21x - 151.71, the mean of [F-] is 1.81E-04 and the concentration in mgF-/L is 3.4. The expected Fluoride in toothpaste according to toothpaste manufacturer: 1000 ppm Fluoride. So how do i calculate the % of F in the toothpaste sample?
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