Why does snow melt more easily after spreading calcium chloride ?

Why does snow melt more easily after spreading calcium chloride ?

1. Calcium chloride can melt snow. After dissolving it into the snow, the freezing point of water is significantly lowered. After using calcium chloride , the freezing point is depressed, allowing snow to melt even at temperatures between -5°C and -20°C. While pure water freezes at 0°C, a calcium chloride solution has a much lower freezing point—often reaching as low as -20°C—which means snow can turn into liquid water even when the ambient temperature is below 0°C.

2. Calcium chloride have a strong hygroscopic ability, when spreading over snow or ice, it can rapidly absorbs surrounding moisture. Even under the low temperatures, Even at lower temperatures, it can make snow turn into liquid salt water more quickly and is less likely to freeze again.