The main component of deicing salt is salt, and anhydrous calcium chloride is one type of salt-based deicing agent. The deicing principle is as follows:
Salting substances absorb heat during dissolution, which aids in the melting of snow.
2. Salt-based de-icing agents dissolve in water (or snow) and have a lower freezing point. For instance, anhydrous calcium chloride (the main component of table salt) has an ice point of around -10℃ when dissolved in water, while anhydrous calcium chloride itself is around -20℃, and acetic acid-based agents can reach about -30℃. Therefore, once salt is dissolved in the snowmelt, it becomes difficult to form ice crystals again, which is beneficial for snow removal.
3. When deicing salt dissolves in water, the ion concentration in the water increases, causing the liquid phase vapor pressure to decrease, but the solid phase vapor pressure of ice remains unchanged. To achieve an equilibrium between the solid and liquid vapor pressures in the ice-water mixture, the ice melts.
That's why anhydrous calcium chloride can melt snow. For more information on the use of anhydrous calcium chloride as a deicing agent, please continue to follow our site!