Which stability concept specifically concerns resistance to chemical decomposition in water?

• A. Oxidative stability
• B. Hydrolytic stability
• C. Demulsibility
• D. Thermal stability

Answer: (B)

Hydrolytic stability focuses on a substance’s resistance to hydrolysis, the chemical breakdown that occurs when water reacts with certain bonds. In aqueous environments, water can attack susceptible linkages—such as esters, amides, or anhydride-like sites—breaking them into smaller fragments like acids and alcohols. Factors like temperature and pH can accelerate this water‑driven decomposition, so substances that maintain their structure and function in water need good hydrolytic stability.

This is why this concept is the best fit for “resistance to chemical decomposition in water.” Oxidative stability is about staying intact in the presence of oxygen and radicals, not water specifically. Thermal stability concerns keeping a material from decomposing at elevated temperatures, regardless of water. Demulsibility relates to how easily an emulsion forms or breaks, which is about phase behavior rather than chemical breakdown in water.