# How do chemists report concentrations?

Jul 9, 2017

$\text{Molality, molarity, parts per million...........??}$

#### Explanation:

$\text{Molality"="Moles of solute"/"Kilograms of solvent}$

$\text{Molarity"="Moles of solute"/"Litres of solution}$

$\text{parts per million"="milligrams of solute"/"Litres of solution}$

As to which term you use that is precisely dependent on the chemistry you do..... Synthetic chemists would tend to use $\text{molarity}$ and $\text{molality}$. Analytical and physical chemists would tend to use $\text{ppm}$.........