Why is there a need to have both molarity and molality?

1 Answer
Apr 17, 2017

Answer:

Why? Because #"molarity"# can be dependent on temperature......

Explanation:

....and depending on the solvent, its concentration over a temperature range may vary.

On the other hand, #"molality"# depends solely on terms that do not vary with temperature: #"moles of solute"/"kilograms of solvent"#. At moderate concentrations there is only marginal difference between the terms.