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  4. The ppm level of F- in a 500 g sample of a tooth paste containing 0.2 g F- is

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Q. The ppm level of $F^{-}$ in a 500 g sample of a tooth paste containing 0.2 g $F^-$ is

AIEEEAIEEE 2012Some Basic Concepts of Chemistry

Solution:

$ppm = \frac{wt. \,of \,solute}{wt.\, of \,solvent}\times10^{6}$
$= \frac{0.2}{500}\times10^{6} = 400$