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Monday, July 8, 2019

Units of Concentration

There are several units of concentration that you will need to be familiar with in order to do the math associated with colligative properties.

They are:
  • Molarity (M) – molarity is the mols of solute over the liters of solution 
  • Molality (m) – molality is the moles of solute over the kilograms of solvent 
  • Mole Fraction (Χ, this is a chi from the Greek alphabet not an x) – mole fraction is the moles of solute over the total moles in the mixture (solute + solvent). Since mole fraction is just a ratio of one part of the mixture to the total, you can find the mole fraction of the solvent as well as the solute. In that case, X is the moles of solvent over the total moles.
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