Copper (II) reacts with citric acid and a neutral complex, C, is formed at lower \(p\)H. The ligand occupies three-co-ordination position and the fourth co-ordination position of copper is most probably oceupied by a molecule of water. The result obtained by \(p\)H titrations indicate the complex C to be a dibasic acid. dissociating successively in two steps to C1- and C22- Conductometric titration of a mixture of citric acid and copper nitrate against standard sodium hydroxide solution qualitatively supports the above results obtained by \(p\)H titration. The equilibrium constant of the reaction of the formation of C from Cu2+ and citric acid with the liberation of two protons and those of the reactions (i) C \( \rightleftharpoons\) C1- \(+\) H+ and (ii) C1- \( \rightleftharpoons\) C22- \(+\) H+ have been determined. The probable structures of the complex have been discussed.