Abstract
Pseudo-first-order rate constants ( k obs) for the alkaline hydrolysis of phthalimide (PTH), obtained at a constant concentration of cetyltrimethylammonium bromide (CTABr) and 35°C, vary with the increase in the concentration of sodium phenylacetate and sodium sulfate (MX) according to the relationship: k obs=( k 0+ θK[MX])/(1+ K[MX]) where θ and K are empirical parameters. The value of θ/ k h W (where k h W= k obs at [CTABr] T=[MX]=0) is the measure of the extent of expulsion of ionized PTH (S −) from CTABr micellar pseudophase to aqueous pseudophase by an inert anion (X −) provided S − is fully micellized in the absence of X −. Thus, the values of θ/ k h W for sodium phenylacetate (≈1) and sodium sulfate (≈0.12–0.19) are attributed to deeper micellar penetration of S − and phenylacetate ions compared to that of sulfate ions.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call