Ternary mercury (II) Complexes with 5-acetamide -1,3,4-thiadiazol-2-sulfonamide (acetazolamide, aza) primary ligand and amino acid L-leucine (leu) or L-serine (ser) or L-cysteine (cys) as secondary ligand have been studied potentiometrically at 25ºC and I= 0.1 M (KNO 3 ) in 40% (v/v) pure ethanol-water medium.Stoiochiometries and stability constants of binary systems containing the above metal ion...