A 500gm tooth paste sample has 0.2gm fluoride concentraion .what is concentration of F in terms of ppm level
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best way to calculate ppm is mg/kg so it would be 0.04ppm
mayank9481:
smjha skte h
ppn means parts per million
sry ppm
so 1mg/kg is 0.01÷1000g =1/1million
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