Lab 10 Procedure - Molecular Weight Determination by...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Molecular Weight Determination by Freezing Point Depression A. Freezing Point of Cyclohexane 1. Obtain a short, wide test tube, a one-hole stopper, and a ½ inch stirring bar from the stockroom. Obtain a Vernier Lab Pro, a temperature probe, and a Palm Pilot. 2. Using a semi analytical balance, weigh the test tube to the nearest 0.01 g. Add 20-25 g of cyclohexane and weigh the tube again to the same precision. Add the stirring bar to the test tube. Fill the beaker about ¾ full with a mixture of ice and water. Place the beaker on the stirrer. 3. Set up the Vernier apparatus. 4. Set the Palm Pilot to collect time-temperature data, one point every thirty seconds. Place the probe in the test tube through the hole in the stopper. Clamp the test tube upright in the bath and monitor the temperature. 5. When the temperature of the liquid reaches 10-12 degrees Celsius, begin the collect data. Note the temperature at which solid first appears in the test tube; keep collecting data until the sample can no longer be stirred.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern