Ortho-dihydric phenols form 1:1 complexes with antimonic acid, as also do glycollic, lactic, malic, mandelic, citric, gluconic, α-hydroxy butyric and galactonic acids. Tartaric acid forms a 1:2 (tart:Sb) complex. Thioglycollic and thiomalic acid forms 1:1 and 2:3 (org:Sb) complexes respectively. Electrophoresis, and conductometric and potentiometric titrations of some α-hydroxy acid complexes have been studied. Complexing has been shown probably to involve the carboxyl and α-hydroxyl or α-thiol groups. Suggestions are made for the formulae of the simpler complexes. The complex stability is sufficient to prevent the precipitation of many insoluble antimonates. The applicability of Job's method of continuous variations is discussed and justified for use in the present study.