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which is colder, frozen saltwater or ice covered in salt? Answered

ice with salt added to it AFTER it froze will be very cold, but how about frozen saltwater will it be colder, warmer or just the same?

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ANDY! (author)2009-05-16

i think salt waters colder because the salts already dissolved in it and the salt on it melts ice, making that colder.

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nutsandbolts_64 (author)ANDY!2009-05-24

looking at all ur ansers is making me confused but i get it please present evidence to convince me

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dpsilver (author)nutsandbolts_642009-11-19

not to be rude but u can easily google the evidence if u need conviction 

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dpsilver (author)2009-11-19

when freezing salt water the salt will come become more concentrated as the water freezes but eventually the whole thing will freeze to think about this is to use the polar caps for eg the water in the ice(sounds wierd) is fresh but it is made from sea water so it has to go down to -20 or something like that to freeze 

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XOIIO (author)2009-05-16

Well, mythbuster did a test, they found that ice in saltwater kept drinks colder for longer. Hope I helped!

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nutsandbolts_64 (author)XOIIO2009-06-16

tnx, but I really didn't find that episode

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Gorfram (author)2009-05-21

Er, which weighs more, a pound of feathers or a pound of lead? :) If the temperature is low enough so that both are solidly frozen, both the frozen saltwater and the ice-covered-in-salt will be at that same temperature (say, -100 C or something) and they will be equally cold. If you then started heating them both up, the one that would melt first; at a lower, colder temperature; would be the frozen saltwater. That's because of what Nachomahma said - it's the mixing of the salt into the water that lowers the melting point, and the frozen saltwater would already be completely mixed at the molecular level..

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NobodyInParticular (author)2009-05-19

When lemonie says 'adding salt to ice can pull it down', the 'it' to which he is referring is the freezing point of the brine. Your home freezer will probably not go that cold.

Also remember that to make 0oC water into 0oC ice, you need to remove quite a bit more energy than to make 1oC water into 0oC water.

You might want to look at this explanation:
http://www.worsleyschool.net/science/files/saltandfreezing/ofwater.html

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lemonie (author)2009-05-17

Sea ice isn't salty, "frozen saltwater" is going to be as cold as the freezer you use.
Adding salt to ice can pull it down to around -16oC I think, but that's an energy process rather than a fixed temperature thing.

L

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NachoMahma (author)2009-05-16

. If the salt concentrations are the same, the frozen brine will be colder. The melting "pure" ice will not be able to absorb enough heat to chill the brine enough. Under the right conditions, you could get close, but never quite as cold.

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