Best Answer:
As ice begins to freeze out of the salt water, the fraction of water in
the solution becomes even lower, and the freezing point drops further!
However, this doesn't continue indefinitely. At some point the solution
will become saturated with salt. This happens for salt in water at
-21.1°C, which therefore is the coldest a saturated solution of salt and
water can get.
At that temperature, the salt begins to crystallize out of solution, along with the ice, until the solution completely freezes. The frozen solution is a mixture of separate salt (NaCl·2H2O) crystals and ice crystals. This heterogeneous mixture is called a eutectic mixture.
At that temperature, the salt begins to crystallize out of solution, along with the ice, until the solution completely freezes. The frozen solution is a mixture of separate salt (NaCl·2H2O) crystals and ice crystals. This heterogeneous mixture is called a eutectic mixture.
Source(s):
http://www.worsleyschool.net/science/fil...
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By the way -21.1 C is -5.98 Fahrenheit degrees
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