Which one is more effective De-Icer? NaCl or CaCl2?

[fifi1314]

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Should use Normality theory. (From Kaplan online workshop)
NaCl produces 2 ions, CaCl2 produces 3 ions... that's all the explanation Kaplan gave.
Still dont know which one is more effective and why?
Thanks!

 

[192LT192]

Should use Normality theory. (From Kaplan online workshop)
NaCl produces 2 ions, CaCl2 produces 3 ions... that's all the explanation Kaplan gave.
Still dont know which one is more effective and why?
Thanks!

this is related to colligative properties/electrolytes. the more electrolytes (solutes) dissolved in the water/ice (which is the solvent here) the more it increases boiling point, lowers vapor pressure, lowers freezing point and increases osmotic pressure. so here, the one that makes the 3 ions will lower the freezing point the most and so can go to an even lower temperature without it freezing. so cacl2 is most effective de-icer bc it can go to a lower temp than nacl would without freezing. thats the way im thinking about it. let me know if its right...

 

[hunterpostbacst]

Nice explanation!

 

[fifi1314]

this is related to colligative properties/electrolytes. the more electrolytes (solutes) dissolved in the water/ice (which is the solvent here) the more it increases boiling point, lowers vapor pressure, lowers freezing point and increases osmotic pressure. so here, the one that makes the 3 ions will lower the freezing point the most and so can go to an even lower temperature without it freezing. so cacl2 is most effective de-icer bc it can go to a lower temp than nacl would without freezing. thats the way im thinking about it. let me know if its right...

Great explanation, thank you!!! Yes, the answer is CaCl2, I checked ask.com
http://chemistry.about.com/b/2008/12/28/what-is-the-best-deicer.htm