In the second week of the experiment purification of pure Butyl Acetate was completed which deviated from the distillation of the Ester. This resulted in the Theoretical Yield of the preliminary experiment being zero.
However a set of raw data was provided, in order to allow an understanding of the calculation section to adhere to the standard required. .
Raw Results.
Boiling Point Of Butyl Acetate:.
122 – 126 degrees centigrade.
1. Yield With Flask:.
41.67 grams.
2. Empty Flask.
20.89 grams.
Mas Of Ester (1 -2):.
20.78 grams.
Calculations.
To calculate the theoretical yield of the experiment from start to finish the following steps must be completed:.
To convert the grams of alcohol to mass in mole the mass in grams must be divided by the relative molecular mass:.
Mass/RMM = Mol (Butan-1-ol).
19.8/74 = 0.2675 mol or 0.27 mol.
Mass/RMM = Mol (Butyl Acetate).
20.78/116 = 0.1791 mol or 0.18 mol.
The theoretical yield must be calculated by the amount of substance in mole of the product or ester divided by the amount of substance in mole that went into the reaction or alcohol multiplied by one hundred:.
Theoretical Yield = What went in (in mol)/What was obtained (in mol) X 100 .
Theoretical Yield = 0.18/0.27 X 100 = 66.6%.
Theoretical Yield = 66.6%.
Discussion.
In order to achieve a logical discussion based on this experiment as whole which includes the first part "The preparation of an organic liquid/ester" and the second part "Further purification" of the experiment, the issue of where yield might have been lost must be addressed which might explain why the calculation did not yield 100%. At different stages of the procedure, the contents of what might have been in the beaker or flask e.g. reagents/product was transferred from vessel to vessel. However it is not possible to state that all the contents were transferred however it is more likely to state that some of it was lost along the way.
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