Grade 12Physical Chemistry
Why is common salt used to clear the snow off the road ?
1 Answer
Anjali Ahuja
In cold countries when there is snow in winter, roads get blocked. This snow can be dangerous to vehicles, since they can skid on it. Hence the snow must be cleared off from time to time. Therefore sea-salt is sprinkled on the snow. It melts and flows away, leaving the road clear
When you cool water below 0°C, it freezes. During this process, the water molecules lose energy, till they stop moving about. They then become arranged in an orderly pattern, losing more heat. At this stage, crystals of ice start to appear.
If there are things mixed in the water, they get in the way of crystal formation. Therefore, the water does not freeze at 0°C. That's what happens when salt is added to water. It lowers the freezing point.
When you cool water below 0°C, it freezes. During this process, the water molecules lose energy, till they stop moving about. They then become arranged in an orderly pattern, losing more heat. At this stage, crystals of ice start to appear.
If there are things mixed in the water, they get in the way of crystal formation. Therefore, the water does not freeze at 0°C. That's what happens when salt is added to water. It lowers the freezing point.
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