During a solvent extraction, a student lost track of which layer was the aqueous layer and which was the organic layer. what simple, non‑destructive test could be used to determine which layer is which? obtain a sample of the solution in the separatory funnel and utilize infrared spectroscopy (ir). add a little of distilled water to see which layer the water adds to. ask the instructor if a supercritical extraction on the sample can be performed. obtain a sample of the solution in the separatory funnel and utilize nuclear magnetic resonance spectroscopy (nmr).