NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What is the characteristic of a hydrophobic solvent?

  1. It mixes easily with water

  2. It is primarily used as a buffer

  3. It is oil and fat based

  4. It increases the viscosity of a substance

The correct answer is: It is oil and fat based

A hydrophobic solvent is characterized by its inability to mix or dissolve in water. Instead, it tends to separate and form distinct layers when combined with water. This behavior is due to the fact that hydrophobic solvents are oil and fat-based, meaning they are nonpolar in nature and do not have an affinity for water molecules. This makes choice C the correct answer. On the other hand: - Option A is incorrect as a hydrophobic solvent does not mix easily with water. - Option B is incorrect as hydrophobic solvents are not primarily used as buffers. - Option D is incorrect as hydrophobic solvents do not necessarily increase the viscosity of a substance.

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