this is my science question on homework
2006-12-06 11:07:00 · 13 answers · asked by GirlyGirl 2 in Science & Mathematics ➔ Chemistry
Adding salt (NaCl) to water adds a solute to a relatively pure solution of H2O. The addition of a solute to water changes both the freezing point and the boiling point (lowers freezing, raises boiling). This helps prevent water and snow on roads from turning to ice.
A completely saturated solution of NaCl and H2O has its freezing point at about 0°F or -18C - so adding salt to roads will not melt ice when the temp is below 0°. Some states will not add salt to roads below about 5F since when the water is kicked up onto windshields, the air temp may be lower than the road temp and freezing occurs.
2006-12-06 11:24:13 · answer #1 · answered by mattmedfet 3 · 0⤊ 0⤋
Salt lowers the freezing point of water, thereby allowing water to remain liquid at lower temperatures. Ice treated with salt "melts" and the water runs off. The road is therefore not covered in ice and safer to drive on. There are about 10 million tons of salt used per year to treat roads in the US.
2006-12-06 11:12:27 · answer #2 · answered by Bruce H 3 · 1⤊ 0⤋
salt does lower the freezing point of water but because salt totally dissociates in solution into Na+ and Cl-. Due to water being a polar molecule it is attracted to these ions more than they are to other water molecules in an attmept to neutralize the difference in charges. When water is bound around these ions it is not able to bond to eachother to create the crystaline structure of ice.......Salt Doesn't absorb moisture
2006-12-06 11:15:35 · answer #3 · answered by Trin 2 · 0⤊ 0⤋
the salt causes the ice to melt because of osmosis. the salt has less water in it then is on the road, so it takes in water.
2006-12-06 11:09:53 · answer #4 · answered by Bandit 1 · 1⤊ 0⤋
When salt is added to water it lowers the freezing point. This means that already frozen water will now turn back to water, increasing driving traction on the road.
2006-12-06 11:09:46 · answer #5 · answered by quagi m 3 · 1⤊ 0⤋
salt melts ice. try putting salt on your arm then an ice cube on it. nothing like a little personal experiment :)
2006-12-06 11:08:53 · answer #6 · answered by Morv 2 · 1⤊ 0⤋
It melts the ice and snow into water
2006-12-06 11:09:53 · answer #7 · answered by AUCT!ON 4 · 0⤊ 0⤋
the salt absorbs moisture which means less ice and also gives traction for cars
2006-12-06 11:10:13 · answer #8 · answered by cheeseburger 2 · 1⤊ 0⤋
to melt the ice but if you think about it it the temperature is cold enough to freeze water/snow into ice, when melted would it not re-freeze into ice again?
2006-12-06 11:09:47 · answer #9 · answered by dan56458 2 · 1⤊ 0⤋
specific, I used a ineffective sea salt facial product. I surely observed a distinction as a ways a the softness of my epidermis and pimples besides. it fairly is unquestionably the product for taking away ineffective epidermis besides. wish this facilitates :-)
2016-10-04 23:36:19 · answer #10 · answered by mauzon 4 · 0⤊ 0⤋