The solubility of a substance in a given solvent refers to the amount of solute (or substance) that can be added to a unit quantity of the solvent. Thus, solubility can be described in terms of amount of solute per unit amount of solvent. In other words,
solubility = amount of solute / amount of solvent
We commonly use g/l (gram per liter) and mg/l (milligram per liter) as units of solubility of a substance in a solvent. For example, the solubility of sodium chloride (NaCl) in water at room temperature (25 degrees Celsius) is 0.36 g/ml.
The solubility of a solute in a solvent is a function of the temperature. As the temperature increases, the solubility of solutes in a given solvent increases. We can also increase the rate of dissolution by stirring the solution.
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