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Salt effects in the aqueous alkaline hydrolysis of N ‐hydroxyphthalimide. Kinetic evidence for the ion‐pair formation
Author(s) -
Khan M. Niyaz
Publication year - 1991
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550230702
Subject(s) - chemistry , valence (chemistry) , aqueous solution , hydroxide , ion , inorganic chemistry , reaction rate constant , salt (chemistry) , hydrolysis , solvent , kinetic energy , kinetics , organic chemistry , physics , quantum mechanics
The effects of the concentrations of LiCl, NaCl, KCl, CsCl, Na 2 CO 3 , BaCl 2 , and Me 4 NCl on the rates of reactions of hydroxide ion with ionized N ‐hydroxyphthalimide (NHP) at 30°C and in a H 2 O–MeCN solvent containing 98%, v / v , H 2 O reveal a nonlinear increase in observed rate constants with increase in salt concentrations. The observed rate constants are highly sensitive to the valence state of cations and almost insensitive to the valence state of anions of the salts. These observations are explained in terms of ion‐pair formation between cations and NHP − .