CHM151ll_Lab_15 - Haydon Connett CHM151 32253 Lab 15 Freezing Point Depression Purpose The purpose of this lab is to determine the concentration of a

CHM151ll_Lab_15 - Haydon Connett CHM151 32253 Lab 15...

This preview shows page 1 - 2 out of 4 pages.

Haydon Connett CHM151 32253 Lab 15 Freezing Point Depression Purpose The purpose of this lab is to determine the concentration of a solution by determining its freezing point and comparing that to the freezing point of the solvent. Materials 10mL Graduated Cylinder Styrofoam Cup Distilled Water 90% Ethyl Alcohol 70% Isopropyl Alcohol Large Test Tube Ice Rock Salt Thermometer Procedures Take the styrofoam cup and fill the bottom with ice and salt. Measure out 2mL of ethyl alcohol and put it in the large test tube. Measure 10mL of distilled water and add to the test tube and mix. Place it in the styrofoam cup, cover it, and carefully fill the cup with ice and rock salt. Remove the cover and place the thermometer in the tube. Every minute, record the temperature for 39 minutes. Rinse out the test tube and repeat. Now do it two more times with isopropyl alcohol. Next, using the freezing point temperature for each trail, calculate the molality assuming the waters freezing point is -1.86 celsius. After the molality is determined, determine how many moles of alcohol is in the solution. Convert that to grams. Now, taking the mass in grams, divide
Image of page 1
Image of page 2

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture