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Answer :
Final answer:
Dichloromethane, with a density of 1.37 g/mL, will form the lower layer when mixed with water in an extraction process. As the more dense liquid, it will be drained first from the separatory funnel, and additional extractions can be conducted with fresh solvent added to the remaining aqueous layer.
Explanation:
The student's question pertains to the density of dichloromethane and its relative position when mixed with water. Since the density of dichloromethane is 1.37 g/mL, which is greater than the density of water (approximately 1.0 g/mL at room temperature), dichloromethane will form the lower layer in an extraction with a water solution.
When performing the extraction, you would typically add dichloromethane to the aqueous solution in a separatory funnel. Once mixed, the two layers will separate due to their differing densities. As dichloromethane is denser, it will settle at the bottom. When dealing with an emulsion, adding water can help to clarify the emulsion by reducing its density, as water mixes with the aqueous layer rather than the organic (dichloromethane) layer.
To collect the dichloromethane after the extraction, you would drain the lower (organic) layer first. In repeat extractions, fresh dichloromethane is added directly to the remaining aqueous layer in the funnel to carry out further extractions without having to remove the aqueous layer.
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