Q: Why can I not separate fluorene now?

Even though you have succeeded in separating 4-methoxybenzoic acid from the original mixture, you cannot remove fluorene yet.

Fluorene is the neutral compound in the mixture. Since it is neutral, it will not react with any inorganic base or acid. There are no sites available for ionization, a critical requirement for solubility in the aqueous phase. Separation of fluorene is not achievable when there is an acidic component (2-naphthol) present in the mixture.

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