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Determination of Molar Mass by Freezing Point Depression

Extracts from this document...

Introduction

Determination of Molar Mass by Freezing Point Depression Investigators: September 1, 2009 1. Objective: * To determine the molar mass of an unknown mixture by measuring the freezing point. * To depress the freezing point of H2O by adding Ethanol. 2. Experimental Methods: 2.1. General Procedure: The procedure was followed from the lab manual, Principles of Chemistry, CHEM 1211L & CHEM 1212L Laboratory Experiments, A Project Oriented Approach, 4th Edition, 2009-Fall, p. 105-114. 2.2. Modifications: * A glass beaker was used instead of a Styrofoam cup for solution run #1 & #2. * Data was recorded for temperature below -10�C for the solution. 3. Experimental Results: 3.1. ...read more.

Middle

11.5 -1.0 -1.0 -7.0 -6.0 12.0 -1.5 -2.0 -5.5 -5.5 12.5 -2.0 -3.0 -5.0 -5.5 13.0 -2.0 -3.0 -5.0 -5.5 13.5 -2.0 -4.0 -5.0 -5.5 14.0 -2.0 -5.0 -5.0 -5.0 14.5 -4.0 -5.0 -5.0 -5.0 15.0 -5.0 -5.0 15.5 -5.0 -5.0 16.0 -5.0 -6.0 16.5 -5.0 -6.0 17.0 -6.0 -6.0 17.5 -6.0 -7.0 18.0 -6.0 -7.0 18.5 -7.0 -7.0 19.0 -7.5 -7.0 19.5 -8.0 -7.0 20.0 -9.0 -7.5 21.5 -10.0 -7.5 22.0 -11.0 -10.0 22.5 -12.0 -10.0 23.0 -13.0 -11.0 23.5 -13.0 -11.0 24.0 -13.0 -11.0 24.5 -13.0 -12.0 25.0 -13.0 -12.0 25.5 -12.0 -13.0 26.0 -12.0 -12.0 26.5 -12.0 -11.0 27.0 -12.0 -11.0 27.5 -11.0 -10.0 28.0 -11.0 -10.0 28.5 -10.0 -8.0 29.0 -10.0 -8.0 3.2. ...read more.

Conclusion

Although, this will not affect the freezing point it will affect the amount of time it takes to reach it. 5. Conclusion: Throughout this experiment the researchers were able to test the capabilities of a solvent to have a lower freezing point. Colligative properties of solutions depend upon the concentration of solute particles. The freezing points of water solutions are always lower than that of pure water. By adding the unknown solution to the pure water mixture did lower the freezing point, thus proving the fact that adding a solution to the water will lower the freezing point. When a pure substance like water freezes, it stays at a constant temperature. However, with a solution the temperature continues to drop as more water is removed. This was demonstrated when water was removed from the styrofoam cup and the temperature dropped. ...read more.

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