Study on Variation of Equlibrium Constant insome Uni-Bivalent Ion Exchange Systems

Abstract

Ion exchange resins in chloride and iodide form were equilibriated
with sulphate and oxalate ion solution of seven different
concentrations varying from 0.010 M to 0.050 M respectively. The
equilibrium study was carried in the temperature range of 30 to 45°C.
For both Cl^-/SO₄^2- and  I^-/C₂O₄^2-  uni-bivalent exchanges the value
of equilibrium constant (K) increases with rise in temperature, indicating
the endothermic ion exchange reaction. Also K value
for  Cl^-/SO₄^2-  ion exchange reaction was observed to be greater
than I^-/C₂O₄^2-   ion exchange reaction i.e., at 30°C the K value of
Cl^-/SO₄^2-   ion exchange was calculated to be 20 while for
I^-/C₂O₄^2-  ion exchange it was calculated to be 0.260 which was
due to the difference in relative selectivity of ion exchange resin
towards I^- and Cl^- ions.