Stability and Related Thermodynamics of Chelation of Zn(ll) with Thiodiacetic Acid (TDAA), Thiodipropionic Acid (TDPA), lminodiacetic Acid (lDAA), Dithiodiacetic Acid (DTDAA) and Diglycollic Acid-(DGA)

Department of Chemistry, Kurukshetra University, Kurakshetra-182 119
Manuscript received 19 December 1981, accepted 21 July 1982

The chelation of Zu(II) with TDAA, TDPA, IDAA, DTDAA and DGA has been studied potentiometrically in aqueous medium at different ionic concentrations (0.1, 0.2 and 0.3 M NaCIO₄) and different temperatures (25, 35 and 45°) using Calvin­-Bjerrum pH titration technique as modified by Irving and Rossotti. The thermody­namic stability constants and thermodynamic functions (ΔG, ΔH and ΔS) have been reported.