Question: 5. An analyst at Procter & Gamble quality control department received a sample of toothpaste to determine the %fluoride. The analyst prepared a series

5. An analyst at Procter & Gamble quality control department received a

5. An analyst at Procter & Gamble quality control department received a sample of toothpaste to determine the %fluoride. The analyst prepared a series of fluoride calibration standards and a total ionic strength adjusting buffer (TISAB) to standardize the fluoride electrode. The results of the potential measurements of the calibration standards are depicted on the figure. The analyst dissolved 0.2364 g of the toothpaste in 100 mL of DI water containing the TISAB. Then, measured the potential of the toothpaste solution to be -170 mV. Potential change, mV iii- Calculate the mass of fluoride in the toothpaste sample. -50 iv- Calculate the %F- in this toothpaste. -100 -150 -200 -250 -300 -10 ii- Calculate the concentration of fluoride in the toothpaste solution. i- Estimate the linear concentration range of this fluoride selective electrode. -8 Lower detection limit -6 y = -63.1x - 401.2 Slope log[F] -4 Upper (1 p- (1.5 (1.5 (1 p

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