Question

A500 g toothpaste sample has 0.2g fluoride concentration .What is the concentration of fluorine in terms of ppm level?

Answer 1

1ppm can be easily expressed as 1 milligram of substance per Kg of parent substance.

In this case 0.2 g of F in 500g toothpaste
0.4g of F in 1kg toothpaste
400mg of F in 1kg toothpaste


So concentration of F is 400ppm

This is an easy way. Hope it helps!

Answer 2

Explanation:

please refer attachment...