Equilibrium of ion exchange of calcium, magnesium and potassium for proton on fibrous carboxylic ion exchanger
https://doi.org/10.29235/1561-8331-2021-57-2-135-143
Abstract
By the method of potentiometric titration of a fibrous aminocarboxylic polyampholyte with a predominant content of carboxyl groups, the equilibrium of the cation exchange of calcium, magnesium, and potassium ions for a hydrogen ion was studied. Due to the low solubility of calcium and magnesium hydroxides in these cases, titration was carried out by Ca(OH)2 and Mg(OH)2, which are formed in solution upon contact with the H-form of the ion exchanger оf increasing portions of solid CaO and MgO. This made it possible to obtain titration curves in a wide range of pH and calcium and magnesium chlorides concentration (0–0.1 eq./L). The dependences of the swelling of ion exchangers on the neutralization degree with the bases of the studied cations are obtained. The coefficients of ion-exchange equilibria are calculated. It was found that the swelling of the ion exchanger is relatively little dependent on its ionic form. The ion exchanger has a higher affinity for calcium than magnesium ion.
About the Authors
V. S. Soldatov
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Vladimir S. Soldatov – Academician, D. Sc. (Chemistry), Professor, Chief Researcher
13, Surganov Str., 220072, Minsk
N. V. Vonsovich
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Natalya V. Vonsovich – Junior Researcher
13, Surganov Str., 220072, Minsk
T. A. Korshunova
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Tatyana A. Korshunova – Ph. D. (Chemistry), Senior Researcher
13, Surganov Str., 220072, Minsk
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