Question

a 500g tooth paste sample has 2.0g fluoride concentration. what is the concentration of f in terms of ppm level

Answer 1

This is a way of expressing very dilute concentrations of substances. Just as per cent means out of a hundred, so parts per million or ppm means out of a million. Usually describes the concentration of something in water or soil. One ppm is equivalent to 1 milligram of something per liter of water (mg/l) or 1 milligram of something per kilogram soil (mg/kg).

the concentration of fluoride in terms of ppm level

PPM=no of parts of the component/total no of parts of allcomponent *10^6

=.2/500 *10^6

=400ppm