Question
\begin{tabular}{l} Why might the percentage yield be above \( 100 \% \) ? \\ a) Some product was stuck on the filter paper \\ b) The precipitation was not complete \\ c) The product is not completely dry \\ d) The unknown compound contained some impurities \\ \hline\end{tabular}
Ask by Knight Coleman. in the United States
Mar 03,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The percentage yield can be over 100% if the product isn't completely dry or if it contains impurities. So, the correct reasons are that the product is not dry and the compound has impurities.
Solution
The percentage yield can be calculated as (actual yield/theoretical yield) × 100. When the yield is above 100%, it means that the product weighs more than expected. This can happen if the product isn't pure. Two common reasons are:
• The product is not completely dry, so residual solvents or water add weight.
• The collected product contains impurities.
Therefore, the correct answers are (c) The product is not completely dry and (d) The unknown compound contained some impurities.
Answered by UpStudy AI and reviewed by a Professional Tutor
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Simplify this solution The Deep Dive
If you observe a percentage yield above 100%, it can often be due to the product not being completely dry, leading to the presence of water or solvents that increase the mass measurement. It’s like finding a soggy sponge; you’re not just weighing the sponge, but also the water trapped within it! Another sneaky culprit can be impurities in the unknown compound. When you weigh the final product, you may inadvertently include these contaminants, which can inflate your yield. Think of it as baking a cake and slicing in some undeclared chocolate chips—it adds extra weight without contributing to the desired result!
