Kinetics of oxidation of sulphur(IV) by peroxodisulphate: Relative reactivity of bisulphite and sulphite ions

Abstract

In the <em>p</em>H region 4.3-8.5, the oxidation of sulphur(IV) by peroxodisulphate (Eq. i) obeys the experimental rate law (ii).<br><br> <img src='http://www.niscair.res.in/jinfo/equation141.gif' border=0><br><br> where <em>k</em>So₃ and <em>k_HSO3 </em> are bimolecular rate constants for the S₂O<img src='http://www.niscair.res.in/jinfo/twobyeight.gif' border=0>- SO<img src='http://www.niscair.res.in/jinfo/three.gif' border=0>- and S₂O<img src='http://www.niscair.res.in/jinfo/twobyeight.gif' border=0>- HSO<img src='/image/spc_char/3_bar.gif' border=0>- reactions and <em>K_d(2)</em> is the dissociation constant of HSO₃<img src='/image/spc_char/3_bar.gif' border=0>-· <em>k_SO3 </em> and <em>k_HSO3 </em> values are 6 x 10^{- 2} and 2.8 x 19^{- 3} dm³mol^{- 1}s ^-1 respectively at <em>I</em> = 1.0 mol dm ^{- 3} and 40°C.