Hot Ice

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The Scientists of Medaille Present

• Hot Ice
• Whats the Problem with the Solution?

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The Mad Scientists of Medaille Present
Hot Ice Whats the Problem with the Solution?

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Words to Know

• Freeze
• Melt
• Solvent
• Solute

• Saturated
• Supercooled
• Exothermic
• Nucleation

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Freeze

• To turn from a liquid into a solid.
• Water freezes into ice at 0o C or 32o F

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Melt

• To turn from a solid into a liquid.

• Lead melts at 700o C

• Ice melts at 0o C

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Solutions

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Supercooled Liquid

• A liquid is supercooled if it is below its
  freezing point without becoming solid.

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Exothermic

• An exothermic reaction releases heat.
• It puts out heat

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• An endothermic reaction is one that gets cold.
• It takes in heat
• Salt and ice

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Nucleation

• The beginning of a phase transition.
• 3 phases of matter Solid, Liquid and Gas.

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Todays Experiment
Making Hot Ice
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How?

• Make solution using a special solvent and solute.
• Supercool solution
• Provide a nucleation point.

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What Should Happen

• Observe phase change
• It will freeze.
• Exothermic gets hot.

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• Sodium Acetate NaCH3COO
• Used in textile and rubber production
• Vinegar flavoring agent

Solute
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• Tasteless and odorless
• Many industrial uses
• Common food additive
• Serious property damage
• Injury death
• Dihydrogen monoxide

Solvent
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Lab Safety

• Eye protection
• No loose clothes
• Wash your hands
• Dont touch your eyes
• No horse play.

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Procedure

• 1 l solvent to near boiling.
• Add 800 g of solute.
• Stir until dissolved.
• Add solute until saturated

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Procedure Continued

• Add solute ?no more will dissolve
• Add solvent ? all is dissolved.

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Procedure Continued

• Pour into clean container
• Stand until cool
• Pour into small containers for experimentation.

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Remember This Guy?

• The same thing is going on with the water as with
  the sodium acetate!

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• The ice in the glass is providing a nucleation
  point for the water

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• Supercooled to below freezing (30o F, or -2o C)
• Nucleation point
• Phase change
• Exothermic (32o F, or 0o C)

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• Its just harder to do this with water because
  supercooled water is not as stable as the sodium
  acetate solution

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