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How to Decrease the Freezing Point of Tetrahydrozoline

Compounds that contain impurities and mixtures of compounds have lower melting or freezing points than the pure compounds. Organic chemists sometimes make use of this principle by taking melting points to determine a sample's purity. You, too, can make use of this freezing-point depression to reduce the melting point of tetrahydrozoline for a chemistry experiment. It's very easy; all you need is to mix it with another compound. The ordinary melting/freezing point of tetrahydrozoline is about 493 degrees Fahrenheit.

Things You'll Need

  • Gloves
  • Eye protection
  • Lab coat
  • Watch glass
  • Spatula
  • Pure tetrahydrozoline HCl
  • Pure xylometazoline HCl
  • Clear vial
  • Label
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Instructions

    • 1

      Don your lab gear before you start.

    • 2

      Add a small amount of the tetrahydrozoline to the surface of the watch glass with the spatula.

    • 3

      Add a small but equal amount of xylometazoline.

    • 4

      Mix the two compounds well with your spatula.

    • 5

      Transfer the mixture to the clear vial with your spatula. Cap it and label it. You now have a mixture that will exhibit a lower melting point than pure tetrahydrozoline.


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