Gluconate Complex of Yttrium (III)

Department of Chemistry, Regional Engineering College, Rourkela - 8

Manuscript received 7 May 1977, accepted 20 May 1977

Gluconate complex of yttrium has been studied by pH titration method. Yttrium forms a doubly charged cationic complex below pH 4.4 which dissociates subsequently to a cationic complex in the pH range 4.4 to 6.0 and finally to a neutral complex C in the pH range 6.0 to 8.4. The equilibrium constants of the reactions Y³⁺ + HGI \(\rightleftharpoons\)  C²⁺  + H⁺, C²⁺ \(\rightleftharpoons\) C⁺ + H⁺, C⁺ \(\rightleftharpoons\)  C + H⁺ and  Y³⁺  + GI^- \(\rightleftharpoons\)  C⁺ + H⁺  are 7.92 x 10^-2 , 1.41 x  10^-6 , 3.29  x  10 ^-3  and 3.52 x  10^-4 respectively.