Final answer:
To perform the solvent-solvent extraction, you would use a separatory funnel.
Step-by-step explanation:
In solvent-solvent extraction, you would use a separatory funnel to perform the extraction. This type of glassware is specifically designed for extracting one solvent from another based on their different densities. It consists of a conical shape with a stopcock at the bottom and two layers for the immiscible solvents to separate. By opening the stopcock, you can drain one solvent while leaving the other behind.