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Some Basic Concepts of Chemistry
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11/08/2021 11:55 am
Topic starter
The ppm level of F– in a 500 g sample of a tooth paste containing 0.2 g F– is
(a) 400
(b) 1000
(c) 250
(d) 200
1 Answer
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11/08/2021 11:57 am
Correct answer: (a) 400
Explanation:
ppm = \(\frac{wt. \; of\;solute}{wt. \; of\;solvent}\times 10^6\)
= \(\frac{0.2}{500} \times 10^6\)
= 400