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Parts per million and molarity

Calculate the following concentrations in micromoles / litre:

1 ppm F ^- in drinking water   µM  

(atomic weight of F 18.9)

Definition:
ppm is parts per million, equivalent to mg per litre

2 ppm Pb ⁺⁺in mains water supply      µM
(atomic weight of Pb 207.2)

4 ppm Al ⁺⁺⁺ in bottled mineral water      µM  
(atomic weight of Al 26.9)

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