A researcher needs a single solvent that will dissolve both acetylsalicylic acid (aspirin) and caffeine for a UV–Vis assay. The solvent must also have a boiling point below 80∘C so it can be removed rapidly after analysis. Which solvent best satisfies these requirements?
a) water (boiling point 100∘C)
b) ethanol (boiling point 78∘C)
c) diethyl ether (boiling point 34∘C)
d) isopropanol (boiling point 82∘C)