There are several methods of expressing concentrations:
1. Percent solutions - W/V (Weight over volume), W/W (weight over weight), V/V(volume over volume)
2. Normality - the gram equivalent weight of a solute per liter of solution.
3. Molarity - the gram molecular weight of a solute per lier of solution.
4. Molality - the gram molecular weight of solute per 1,000 gram of solvent.
