Freezing Point Depression And Determining Molecula

The purpose of this lab was to find the molecular weight of cardinal unknown substances by analyzing the freezing requests in cyclohexane and to provide a visual representation of the freezing psyche depression effect. The possibility of this lab is; by using measurements of mass of the unknown substances (solute) in correlation with the mass of the cyclohexane ( resolvent) and the freezing point constant of the solvent, you could make up ones mind the molecular weight of the solute by using the aforementioned(prenominal) maths involved in deciding the freezing point of the stem/ The theory behind the visual of the FPD effect is that if one was to depict the freezing point of a solution and two solutions of the same substances with to a greater extent solute, one would see a visible cop in freezing point. The equations you necessary for this lab were the freezing point formula for organic substances (?Fp=(m)Kf) and the equation for molality (M=g/(GFMxKg)).
The equipment you needed to do this lab was a glass thermometer, a stopwatch, a pencil, a large glass beaker, a 50 g. running play underground to contain the solution of cyclohexane plus the unknown solute, and an repeal graph.
The procedure was:
1.Make an ice bath
2.Measure the assay tube of pure cyclohexane
3.Measure pure solvent
4.Add the solvent to the cyclohexane
5.



Take the temperature of solution before submersion
6.Submerge the test tube in the ice bath and record the temperature all thirty seconds for nine minutes, recording the temperature the solution starts to freeze at.
7. restitute the solution to the temperature it was before freezing
8.Re-do footmark six
9.Add more solute to the solution and repeat step six, two times
10.Repeat step nine
11.Make a graph reflecting the timed data
12. Use the changes in the freezing point, recorded mass of the solute and solvent and the freezing point constant for cyclohexane to determine the molecular weight of the unknown substances, two with and without the additions by using the change in freezing...If you want to last a full essay, order it on our website: Orderessay



If you want to get a full essay, wisit our page: write my essay .