Supersaturated solution introduction
Under certain conditions, the smaller the crystal particles, the greater the solubility. Therefore, when the solution is evaporated at a constant temperature, the concentration of the solute gradually increases. When the saturation concentration of the ordinary solute crystal is reached, the solute of the small crystal has not yet reached the saturation state, and the nucleus as the core of crystal growth is difficult to precipitate. In order for the crystal nucleus to be generated automatically, it is necessary to further evaporate the solution to a certain degree of supersaturation before the crystal may continuously precipitate. According to the phase equilibrium condition, there should be a solution where crystals are precipitated but not precipitated, which is called supersaturated solution.