Final answer:
Acetone should not be used as the organic solvent in an acid-base extraction due to its reactivity with the acid or base being extracted and its volatility. It is a highly polar solvent that can interfere with the extraction efficiency and its high vapor pressure can make it challenging to control in the process.
Step-by-step explanation:
Acetone should not be used as the organic solvent in an acid-base extraction because it is a highly polar solvent and can potentially react with the acid or base being extracted. Acetone contains a polar C=O double bond which can interact with the acid or base molecules, leading to a loss of their extraction efficiency. Additionally, acetone is a volatile solvent with a high vapor pressure, which can make it difficult to control in an extraction process.