T/F. Tinctures cannot be mixed with liquids too diverse in solvent character because the solute can precipitate

• A. False
• B. Not sure
• C. Sometimes
• D. True

Answer: (D)

Solubility depends on the solvent environment, especially its polarity and composition. A tincture is a solution in alcohol (often with some water). When you mix it with a liquid that has a very different solvent character—significantly more polar or more nonpolar—the balance of interactions between solute and solvent changes. If the new mix is less favorable for keeping certain solute molecules dissolved, their concentration can exceed what the solvent can hold, and they precipitate out as solid particles. This is why diluting or altering the solvent composition can lead to precipitation of tincture constituents.

So the statement is true: mixing tinctures with liquids that are very different in solvent character can cause the solute to precipitate. In practice, this is why you may see cloudiness or settling when combining tinctures with certain fluids, and it highlights the importance of matching solvent properties to maintain solubility and dose consistency.