Dissolution and crystallization in walk-in cooler
Dissolution and crystallization in walk-in cooler Dissolution and crystallization in walk-in cooler When a solid solute (such as lithium bromide) is placed in a solvent (such as water), the molecules (or ions) on the surface of the solute ) Due to its own vibration and the attraction of solvent molecules, it separates from the surface of the solute and diffuses uniformly into the solvent to form a solution. This process is called dissolution. In the dissolution process, it is often accompanied by the release or absorption of heat, which is called the heat of dissolution. The heat of dissolution is caused by the fact that when the substance is dissolved in water, on the one hand, the endothermic process of solute particles spreading in the water occurs, on the other hand, the exothermic process of the solute molecule and the water molecule combining with each other to form a hydrate. If the heat absorbed by the previous process is greater than the heat released by the latter process, the dissolution process is an endothermic process and the solution temperature decreases; on the contrary, the dissolution process is an exothermic process and the solution temperature increases. The process of dissolving lithium bromide in water is an exothermic process. At a certain temperature, if the solid solute is continuously added to a certain amount of solvent, at the beginning, the dissolution process continues, and when it increases to a certain amount, the added solute will no longer continue to dissolve, the solution at this time is called It is a saturated solution. The amount of solute contained in the saturated solution is called the solubility at that temperature. Usually expressed in grams of solute contained in 100 grams of solvent. The solubility of is relative, it is not only related to the characteristics of the solute and solvent, but also related to temperature. In a saturated solution at a certain temperature, when the temperature decreases, the solubility decreases, and there are solid solute crystals in the solution. This phenomenon is called crystallization. The dissolution and crystallization of are two opposite processes in solution, both of which are continuously performed. If the rate of dissolution is equal to the rate of crystallization, the amount of solute in the solution remains unchanged and is in dynamic equilibrium. A saturated solution is a solution in dynamic equilibrium. pressure has little effect on the solubility of solids and liquids, but has a large effect on the solubility of gases. For example, the solubility of ammonia in water increases with pressure. The above articles are from refrigerated showcase display cooler and walk-in cooler. For details, please log in: www.ihdjx.com Free Order Hotline: +86 18019567573 Contact: Mr. Shao 26066250@qq.com
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