The thermodynamic dissociation constants of oxalic acid in water
Degree GrantorUniversity of Canterbury
Degree NameMaster of Science
The values given in literature for the first and second dissociation constants of oxalic acid at 25°C. vary considerably. For the first dissociation constant some of the vales given are; .038 (Chandler, by conductivity); .17 (Britton, by electrimeric titration; .057 (Drucker); 0.59 (Gane and Ingold, by electromeric titration), and .02 (GLastone), which do not show good agreement. Fir the second dissociation constant, values are; 4.9 x 10-⁵ (Chandler); 6.9 x 10-⁵ (Drucker), 13.8 x 10-⁵ (Britton), 6.4 x 10-⁵ (Gane and Ingold), 3 x 10-⁵ (Glastone) and 5 x 10-⁵ (Pilbrick) which also show poor agreement. In the present work an endeavour is made to determine by an accurate thermodynamic method the true second dissociation constant of oxalic acid at 25°C, 30°C, and 35°C. and the true first dissociation constant at 25°C.