# How does molarity change with temperature?

May 17, 2018

Well, by definition, $\text{molarity"="moles of solute"/"volume of solution}$
Now the $\text{moles of solute}$ are a constant. The volume of solution MAY change substantially with increasing or decreasing temperature. In some calculations $\text{molality}$ is used in preference, which is defined by the quotient....
$\text{molality"="moles of solute"/"kilograms of solvent}$
....this is temperature independent, and at lower concentrations, $\text{molarity"-="molality}$.