How can you convert between molarity and molality?

1 Answer
anor277
May 21, 2018

The solution density is required....

Explanation:

By definition, "molarity"="moles of solute"/"volume of solution"...and thus the units of "molarity" are mol*L^-1. On the other hand, "molality"="moles of solute"/"kilograms of solvent"...and thus "molality" is temperature independent given that mass, unlike volume, is UNAFFECTED by ambient pressure.

For dilute AQUEOUS solutions...."molality"~="molarity".

In other scenarios, we need the solution density to calculate one from t'other, and vicey versy...

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