Molality
Molality is another measurement of concentration. Unlike molarity, which looks at the concentration through the volume of the solution,
Please understand Molarity first!
Molality looks at the concentration by evaluating the mass of the solvent.
Seems complicated, but it isn't. The Formula Here's the formula:
Molality (m) = Moles of Solute
Kilograms of Solvent
When doing calculations, use the unit mol/kg, and when done us the unit m. (Small letters! Capital M stands for Molarity!)
Explaining the Procedure
If your chemistry teacher ordered you to prepare a 100 m of HCl to punish a student, an example of what you would do is this:
Get 100 moles of HCl, then 1 kg (or 1 L since the density of water is 1 kg/L) of water, and just mix them together.
Here, you do not care about the volume of the solution, or the final product. All you need is the set amount of moles, and set amount of solvent, and just mix them together.
Now let's move on to a comparison between both.
