After extracting a mixture of organic compounds dissolved in ethyl acetate sequentially with acidic and basic water, the only organic compounds remaining dissolved in the ethyl acetate are
the neutral organic compounds.
Acidic water is used to extract basic organic compounds from the ethyl acetate, as these compounds will react with the acid to form water-soluble salts that can be extracted into the aqueous phase. On the other hand, basic water is used to extract acidic organic compounds from the ethyl acetate, as these compounds will react with the base to form water-soluble salts that can be extracted into the aqueous phase.
The organic compounds that are neither basic nor acidic will remain dissolved in the ethyl acetate layer even after extraction with acidic and basic water. These are considered to be neutral organic compounds, and they will only be present in the ethyl acetate phase.