Weight Ratio Percentage Concentration
- Weight Ratio Percentage is a way of expressing the concentration of a solution.
- Solubilities are often expressed as a weight ratio:
Units of solubility: grams of solute per 100 g of water
Solubility of sodium chloride is 36 g/100 g water at 25° C
- Weight Ratio concentration = mass solute ÷ mass solvent
- Weight Ratio Percentage concentration = weight ratio × 100
OR Weight Ratio Percentage concentration = mass solute
- Any units of mass (weight) can be used for the calculation but the mass of solute and the mass of solvent must be in the same units.
If the mass of solute is in grams, the mass of solvent must also be in grams.
If the mass of solvent is in kilograms, the mass of solute must also be in kilograms.
- Weight Ratio Percentage concentration must NOT be confused with Weight (Mass) Percentage concentration (w/w).