why do we put salt on sidewalks when it snows

Question: why do we put salt on sidewalks when it snows
- Keywords:
  chemistry,
  salt,
  snow
Asked by anon-238824 to binuraj, Alice on 18 Mar 2020.
- Binuraj Menon answered on 18 Mar 2020:
  
  Hi Made389 gas
  
  Good question. Salt melts ice and snow by lowering its freezing point. Salt is best put on the roads before they freeze or before snow arrives. Then, as snow falls, the salt mixes with it, lowering its freezing point.

Question: why do we put salt on sidewalks when it snows