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Posted by on Tuesday, February 21, 2012 at 9:11pm.

A pan full of hot salt water, NaCl(aq), is cooled and NaCl(s) precipitates. Explain why this happens.

Chloride ions are more strongly attracted to the metal in the pan than the sodium ions at low temperatures.

As the vapor pressure of the solution decreases the solubility of the salt goes down.

As the temperature decreases the solubility of the salt goes down and the salt in excess settles out as a precipitate.

As the temperature decreases the solubility of the salt goes up and the salt in excess dissolves.

  • chemistry - , Tuesday, February 21, 2012 at 9:14pm

    is the answer Chloride ions are more strongly attracted to the metal in the pan than the sodium ions at low temperatures?

  • chemistry - , Tuesday, February 21, 2012 at 9:22pm

    I think that's hogwash.

  • chemistry - , Tuesday, February 21, 2012 at 9:35pm

    then is this the correct answer

    As the temperature decreases the solubility of the salt goes down and the salt in excess settles out as a precipitate.

  • chemistry - , Tuesday, February 21, 2012 at 9:42pm

    That's much better, although the solubility of NaCl is not much higher at 100 C than it is at 0 C.
    http://www.kentchemistry.com/links/Kinetics/SolubilityCurves.htm

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