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In order to make proper ice cream, which is smooth and creamy, This is most easily done by using a mixture of ice, water, and salt, which will be at a temperature many degrees colder than 0°C. Since you are using the salt/ice solution just for rapid cooling, and not eating it, you can use any kind of salt.
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www.worsleyschool.net/science/files/saltandfreezing/ofw...
www.worsleyschool.net/science/files/saltandfreezing/ofwater.html
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The salt is not actually making the ice colder. The internal portions of the ice are already below 0 degrees Celsius. The salt, or NaCl, gets in the way of the intermolecular forces of the water, allowing the ice to melt at lower temperatur...
http://wiki.answers.com/Q/Why_does_rock_salt_make_ice_c...
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Why adding salt to ice lowers the temperature Why does adding salt to ice lower the temperature? SEED FAQ 1112 explains why adding salt to water lowers the temperature at which it changes phase from a liquid (water) to a solid (ice) and vi...
http://answers.yahoo.com/question/index?qid=20090126174...
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Asker's Comment: I am kinda dense ..the ice was cold before adding salt..adding salt turned it to saltwater, and the extra cold came from neg calories which came from where ... Just because water freezes at 32 degrees, doesn't mean that ice is 32 degrees. When you take the ice out of the freezer, it is much colder than that.
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answers.yahoo.com/question/index?qid=20070206204416AAVi...
answers.yahoo.com/question/index?qid=20070206204416AAVi2K3
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When salt is added to ice, nothing happens at first. You need for a little of the ice to melt, so that some salt can dissolve in the meltwater to make saltwater. When ice melts and no salt is around, ice and its meltwater are constantly exchanging.
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www.newton.dep.anl.gov/askasci/gen01/gen01008.htm
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Discuss the fact that we put salt on the roads to help melt ice and prevent slippery conditions. (Salt lowers the freezing point of water.) You can also describe how this allows us to make ice colder by adding salt.
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www.teachers.net/lessons/posts/454.html
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(Salt lowers the freezing point of water.) You can also describe how this allows us to make ice colder by adding salt. You can demonstrate this, or do small group investigations by using a thermometer in a plain cup of water, then adding just ice, then salt to it.
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www.msu.edu/~tromble7/Lessons.html
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So, how do you make the ice colder? The trick is adding the salt. It is a well-known phenomenon to chemists that a solution, such as salt-water, will freeze at a lower temperature than a pure liquid, such as water.
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membership.acs.org/C/Chicago/ChmShort/cs95.html
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It cant make it colder but it can make it melt. That is not correct. Adding salt to ice water does make it colder. It lowers the freezing point of the water making the mixture colder. in fact the ice will melt more slowly.
http://wiki.answers.com/Q/Can_adding_salt_to_ice_water_...
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