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  4. A 500 g tooth-paste sample has 0.2 g fluoride concentration. What is the concentration of fluoride in terms of ppm level?

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Q. A $500\, g$ tooth-paste sample has $0.2\, g$ fluoride concentration. What is the concentration of fluoride in terms of ppm level?

NTA AbhyasNTA Abhyas 2020Some Basic Concepts of Chemistry

Solution:

As $500\, g$ of toothpaste $\equiv 0.2\, g$ of $F^{-}$
So $10^{6} g$ of toothpaste $\equiv \frac{0.2\, g \times 10^{6} g }{500\, g } F ^{-}$
$=400\, g\, F ^{-}$
Hence, concentration in ppm is $400$.