To separate two liquids that have formed a solution, the scientist can use a technique called distillation. This method is effective when the two liquids have different boiling points.
In distillation, the mixture is heated until one of the liquids vaporizes. The vapor is then collected and cooled in a condenser, turning it back into a liquid and allowing it to be separated from the other liquid that remains in the original container.
If the liquids are miscible (i.e., they mix completely and do not form distinct layers) and have similar boiling points, other techniques such as liquid-liquid extraction or fractional distillation may be appropriate alternatives, depending on the specific chemical properties of the liquids involved.