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Chemistry Lab Essay, Research Paper

Lab Report

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Introduction:

The intent of this lab was finding the molecular weight of an unknown solid organic compound by stop deading point depression. In order to make so, one has to foremost, freezing cyclohxane, by seting it in ice cold H2O, and see what the changeless temperature comes out as. Then, one has to stop dead.4 gms of there unknown, and cyclohexane by making the same procedure and besides see what the changeless temperature will come out as. After calculating out your changeless temperature, on should so stop up their Numberss into the equations.

Procedure:

These equations were given in the lab processs for experiment figure 10 Experiments for General Chemistry at Yavapai College

Pure Impure

temp clip temp clip

23.8 15 24.2 15

21.8 30 22.3 30

16.7 45 16.4 45

12.4 60 12.1 60

10.2 75 9.9 75

9 90 8.7 90

7.9 105 8 105

7.5 120 7.6 120

7 135 7.5 135

6.7 150 7.3 150

6.4 165 7.1 165

6.4 180 6.9 180

6.4 195 6.7 195

6.4 210 6.5 210

6.4 225 6.5 225

6.4 240 6.5 240

temp clip temp clip

25.5 1

5 19.7 15

22.7 30 16.5 30

15.7 45 11.5 45

10.8 60 8.4 60

7.9 75 6.5 75

6.1 90 5.4 90

5 105 4.2 105

4.2 120 3.5 120

3.1 135 3.1 135

2.8 150 2.8 150

2.7 165 2.6 165

2.6 180 2.5 180

2.5 195 2.5 195

2.2 210 2.4 210

2.2 225 2.4 225

2.2 240 2.4 240

Pure Substance Impure Substance

Consequences and Calculations:

Molality = moles of solute/Kilograms solvent Density = 0.77g/ml

D = Mass/volume

Volume = 25ml

( .77g/ml ) = ( m/25ml ) 19.25/g ( 1kg/1000g ) 4.3 = 20* milliliter *m

= 19.25g = .01925k M = .215

( .215M ) = ( .4012/ mw ) / ( .01925 kilogram )

= ( .00414M ) = ( .4012/mw )

= ( .4012 ) / ( .00414M ) = 96.908mw

Decision:

The consequences for this experiment turned out as the molecular weight being 96.9. The weight of unknown originally was 128 ; hence the molecular weight that was calculated was merely away by 31.1. The per centum mistake of the whole experiment was 34.3 % . The lone thing that could hold semi contaminated this experiment was the rust from the scaremonger. Other than that, there is nil else the experimenter can believe of.

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