Application of Tracer Isotopes in Kinetic Study of First Order Ion Exchange Reaction

Abstract

Analysis of first order ion exchange reaction rates at different
temperatures [27°C to 50°C] and particularly at low concentration
of KBr solution [electrolyte] ranging from 0.005  M to 0.1 M has
been carried out by application of radioactive tracer isotope ⁸²Br
with increase in concentration of electrolyte. Amounts of bromide
ion exchanged in millimoles increases specific reaction rates of ion
exchange reaction and are calculated for different temperatures and
for different amounts of ion exchange resins. It is observed that
with increase in temperature reaction rate increases but the increase
is more pronounced for increase in amount of ion exchange resins.
For 0.005  M solution of electrolyte, the reaction rate increases from
0.120 min^-1 at 27°C to 0.209 at 50°C. For 0.005 M solution of
electrolyte at 27°C reaction rate increases from 0.120 min ^-1 for 1.0
g of resin to 0.190 min^-1 for 5.0 g of resin. From the reaction rate
calculated at different temperatures energy of activation in KJ/mole
is calculated. It is observed that for 0.005M solution of electrolyte,
energy of activation is 6.801 kJ/mole which decreases to 6.120
kJ/mole for increase in concentration of electrolyte to 0.100 M.