Question

Why do some scientists prefer to express concentrations of water contaminants in the units ppm and ppb rather than molarity?

Answer 1

Explanation:

These molarity units are used to express very small solute concentrations. Molarity cannot be used to express small amount of solute dissolved in solvents.

parts per million ppm  is a dimensionless quantity that represents the part of a whole number in units of $\frac{1}{1000000}$

parts per billion ppb represents the part of a whole in units of  $\frac{1}{1000000000}$

These quantities are useful in determining very small amount of solute like gold concentration in stream sediments.

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