If the sample crude product is incompletely dried it will contain impurities such as water, the water of crystallization hydrates, and unreacted reagents. If the crude product is incompletely dried the bulk of the experimental yield will be higher.
It contains more undesirable compounds than impurities and is a must-have. Therefore, if the experimental yield value is higher than the actual mass, the yield rate will be higher. From this, we can conclude that incomplete drying of the product increases the percent yield value.
Usually, the yield rate is understandably less than a hundred percent for the reasons mentioned above. However, if the measured reaction product contains impurities, it can have a higher mass than if the product were pure.
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