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Question

If 500 g pack of colgate toothpaste contains 0.2 g of fluoride (F). Express the concentration of fluoride in terms of ppm.

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Solution

1 ppm can be easily expressed as 1 milligram of substance per kg of parent substance.
In this case 0.2g of F in 500g toothpaste
0.4g of F in 1kg toothpaste
400mg of F in 1kg toothpaste
so concentration of F is 400ppm

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