In each of the following examples, a human procedural error has been committed.

Question

In each of the following examples, a human procedural error has been committed. Identify the error and indicate how the student should correct the problem in order to complete the experiment. Starting over is an option, but it is not always the best choice. a. A dichloromethane solution containing a solid reaction product was left to evaporate until the next lab period. At that time, virtually no dichloromethane had evaporated. B. The calculated percent yield from an experiment was more than 100%.

Explanation / Answer

a) Since the solid product contains dichloromethane, it is difficult to remove just by evaporating by itself. Because the dichloromethane may be trapped in the solid crystals.
So, it is recommended to use high vacuum for complete removal of dichloromethane.

b) dichloromethane is high density liquid (1.33 g/mL). So, if the product contains dichloromethane it will mislead in the calculations and sometime it will show more than 100% yield.
So, it is recommended to dry the sample and make sure no solvent present. Then try to calculate the yield of the product.

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