Question

500g tooth paste sample has 0.2g fluoride ion concentration. What is the concentration of fluoride in terms of ppm level ?

Answer 1

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

=0.2/500 *10^6

=400ppm

:)