Autoxidation of hydroxylamine in alkaline solutions. Part II. Kinetics. The acid dissociation constant of hydroxylamine

Abstract

The kinetics of autoxidation of hydroxylamine in the presence of ethylenediaminetetra-acetic acid have been studied in the hydroxide ion range 0·5–3·2 mol dm^–3. They confirm that a deprotonated hydroxylamine species is involved in the rate-determining step and allow the calculation of the acid dissociation constant at 25 °C (pK_a= 13·71). This constant has also been determined by a spectrophotometric method (pK_a= 13·74).