If the alum is not completely dried than the calculated yield will be too high because while calculating the weight of alum, it will include the weight of water present in it as a result the calculated weight will be high. Thus yield will be high
If the solid is not completely dissolved than the yield will be low becsuse only the dissolved part will take participate in reaction and not the complete sample as a result yield will be low compared to what we expected from initial amount taken.
No change in yield if the ethanol is spilled before pouring because reaction has been completed
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