Distillation and Refractometry

Distillation and Refractometry - Andre Hinojosa 12601675...

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Andre Hinojosa 12601675 Partner: Chelsea Azevedo TA: Nick Barczak 7/15/2010 Distillation and Refractometry In this lab, we used only fractional distillation to determine the composition of our unknown solution. We used 25 mL of unknown solution #12 which was a clear, colorless solution with a faint smell. After assembling our distillation apparatus, we covered our distillation flask and chamber with layers of aluminum foil to help retain the heat. The heating apparatus used was a sand bath to ensure even heating. We also added 2 boiling stones to our flask to ensure even heating of the liquid as well. At 22˚C we noticed our solution start to boil. After several minutes, the temperature rose to 53˚C where we received our first drop of liquid. After that, the thermometer read a constant 54˚C where we received our first 2.5 ml of liquid. At the 2.5 mL mark, however, the temperature rose to 62˚C where we changed our graduated cylinder. From here, the temperature rose to 98˚C and stayed constant through our collection of 10 mL. One thing we did notice that in the
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