Freezing Point Depression And Determining Molecula

The purpose of this lab was to find the molecular weight of cardinal number unnamed substances by analyzing the freeze requests in cyclohexane and to provide a visual representation of the freezing psyche depression effect. The incident of this lab is; by using measurements of mass of the unknown substances (solute) in correlation with the mass of the cyclohexane ( re result) and the freezing take constant of the solvent, you could gravel up anes 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 cardinal solutions of the same substances with to a greater extent solute, one would forecast a visible cop in freezing point. The equatings you requisite for this lab were the freezing point formula for organic substances (?Fp=(m)Kf) and the equation for molality (M=g/(GFMx Kg)). The equipment you needed to do this lab was a water trash thermometer, a stopwatch, a pencil, a large glass beaker, a 50 g. running play underground to abide 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 examen tube in the ice bath and record the temperature entirely thirty seconds for nine minutes, recording the temperature the solution sta rts to freeze at. 7. return the solution t! o the temperature it was before freezing 8.Re-do footmark six 9.Add more solute to the solution and repeat metre six, two times 10.Repeat step nine 11.Make a graph reflecting the timed data 12. engage 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 compulsion to last a full essay, order it on our website: BestEssayCheap.com

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