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/sci/ - Science & Math

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1248675 No.1248675 [Reply] [Original]

Why would we use rock salt instead of table salt to lower the freezing point of an ice bath?

>> No.1248851
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1248851

The iodine in that much table salt would have a significant radioactive signature; it would be dangerous.

>> No.1248867

>>1248675
why would you ask a homework question on /sci/ ?

>> No.1249176

>>1248867
It's always something that I've been told since hs chem. Always took it for granted and now I'm wondering why. Same goes for ice cream making.

>> No.1249186
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1249186

rock salt's cheaper

>> No.1249695

colligative properties: freezing point depression

freezing point depression = Kf*c*i, with Kf and c being constant for your problem. i is the number of pieces the shit you add breaks into. The formula for table salt is NaCl - it breaks into Na and Cl, 2 atoms. Some of the rock salts sold for these purposes, like the ones that driveways are iced with, are, in fact, not rock salt but other salts with a higher i value. Otherwise, it's just a cost issue.