| Abstract: | The reaction of NO with O2 has been investigated in aqueous solution. As demonstrated by ion chromatography, the sole product is NO2?. Kinetic studies of the reaction by stopped-flow methods with absorbance and conductivity detection are in agreement that the rate law is -dO2]/dt=kNO]2O2] with k = 2.1 × 106 M?2 s?1 at 25°C. This rate law is unaffected by pH over the range from pH 1 to 13, and it holds with either NO or O2 in excess. By studying the reaction over the temperature range from 10 to 40°C, the following activation parameters were obtained: ΔH≠ = 4.6 ± 2.1 kJ mol?1 and ΔS≠=?96 plusmn; 4 J K?1 mol?1. © 1993 John Wiley & Sons, Inc. |
