5 Solubility
Solubility is defined as the amount of substance that passes into solution to achieve a
saturated solution at constant temperature and pressure. Solubility are expressed in terms
of maximum volume or mass of the solute that dissolve in a given volume or mass of a
solvent. Pharmacopoeias give solubility in terms of the number of parts by volume of
solvent required to dissolve one part by weight of a solid, or one part by volume of a liquid.