THE HYDROLYSIS of aspirin in aqueous solutionThas been investigated extensively by Edwards(1,2) and Garrett (3,4). They determined overall first-order rate constants as a function of p Hand proposed various reaction mechanisms.The effect of anionic, cationic, and nonionic surfactants on the stability of solubilized aspirin hasbeen studied by Nogami et al. (.5). It was shownthat each surfactant suppressed tlichydrolysis ( if unionized aspirin, while the hydrolysis of theanionic form of aspirin was suppressed only bycationic surfactants.