What is the practical difference between "molarity"molarity, and "molality"molality?

1 Answer
anor277
May 2, 2017

At low to moderate concentrations IN AQUEOUS solution, the difference is minimal and can be ignored.......

Explanation:

By definition................

"Molarity"="Moles of solute (mol)"/"Volume of solution (L)"Molarity=Moles of solute (mol)Volume of solution (L), and thus has units of mol*L^-1mol⋅L−1.

"Molality"="Moles of solute (mol)"/"Mass of solvent (kg)"Molality=Moles of solute (mol)Mass of solvent (kg), and thus has units of mol*kg^-1mol⋅kg−1.

Molality is often preferred in that it is independent of density, and thus independent of temperature.

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