Determination of the composition and stability constants of complexes in Co (II) - malic acid system

  • M. Zhamanbaeva D. Serikbayev East Kazakhstan State Technical University, Ust-Kamenogorsk
  • Mariya Abilova al-Farabi Kazakh National University
  • G. Kashkanova D. Serikbayev East Kazakhstan State Technical University, Ust-Kamenogorsk
  • Altynai Mussabekova al-Farabi Kazakh National University
  • Aiman Shaldybaeva al-Farabi Kazakh National University
DOI: https://doi.org/10.15328/chemb_2013_4162-167
Keywords: complex compounds, cobalt (II), malic acid, stability constant, composition, balance, light absorption

Abstract

This paper presents the results of spectrophotometric and pH-metric study of Co (II) - malic acid system. Optical density of solutions was determined spectrophotometrically in a wide wavelength range at constant ionic strength and pH values. The compositions of the complexes formed in the system were determined. The results obtained are confirmed by pH titration. It was shown that the stability of complexes varies in the row: Co (II): H3Mt = 1:2 <1:1 < 2:1.

References

1. Samir Abu Ali, Dobrynina N.A., Martynenko L.I. pH-metric study of complex formation of rare-earth elements with malic acid in aqueous solutions [pH-metricheskoye izucheniye kompleksoobrazovaniya redko-zemel'nykh elementov s yablochnoy kislotoy v vodnykh rastvorakh] . Zhurn. neorg. khimii - J. Inorg. Chemistry, 1980. 25(11), P.2977-2980.

2. Demyanchuk L.S., Kostromina N.A. Complex formation of lead (II) with malic and tartaric acids in aqueous solutions [Kompleksoobrazovaniye svintsa (II) s yablochnoy i vinnoy kislotami v vodnykh rastvorakh] // Zhurn. neorg. khimii - J. Inorg. Chemistry, 1984, 29(11). P.2807-2809.

3. Pyatnitskiy I.V. Analytical chemistry of cobalt [Analiticheskaya khimiya kobal'ta]. Moscow: Mir, 1965. 260 p.

Published
2013-09-14
How to Cite
Zhamanbaeva, M., Abilova, M., Kashkanova, G., Mussabekova, A., & Shaldybaeva, A. (2013). Determination of the composition and stability constants of complexes in Co (II) - malic acid system. Chemical Bulletin of Kazakh National University, 72(4), 162-167. https://doi.org/https://doi.org/10.15328/chemb_2013_4162-167
Issue
Vol 72 No 4 (2013): Chemical Bulletin of Kazakh National University
Section
Inorganic Chemistry
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