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Complex formation in the ternary system Mg(II)-CO₂-H₂O

Authors:	Walter Riesen Heinz Gamsjäger Paul W Schindler

Institution:	Institut für anorganische Chemie, Freiestrasse 3, CH-3000 Berne, Switzerland

Abstract:	The carbonato and hydrogencarbonato complexes of Mg²⁺ were investigated at 25 and 50° in solutions of the constant ClO₄^? molality (3 M) consisting preponderantly of NaClO₄. The experimental data could be explained assuming the following equilibria: Mg²⁺ + CO_{2_B} + H₂O ag MgHCO⁺₃ + H⁺, $log^{1} β_{1} = ?7.64_{4} ± 0.01_{7} (25°), ?7.46_{2} ± 0.01_{1} (50°)$ , Mg²⁺ + 2 CO_{2_g} + 2 H₂Oag Mg(HCO₃)⁰₂ ± 2 H⁺, $log^{1} β_{2} = ?15.00 ± 0.14 (25°)$ , ?15.37 ± 0.39 (50°), Mg²⁺ + CO_{2_g} + H₂Oag MgCO⁰₃ + 2 H⁺, $log^{1} k_{1} = ?15.64 ± 0.06 (25°)$ ,?15.23 ± 0.02 (50°), with the assumption γ_MgCO₃⁰ = γ_{Mg(HCO₃)⁰₂}, ΔG⁰(I = 0) for the reaction MgCO⁰₃ + CO_{2_g} + H₂O = Mg(HCO₃)⁰₂ was estimated to be ?3.9₁ ± 0.8₆ and 0.6 ± 2.4 kJ/mol at 25 and 50°C, respectively. The abundance of carbonate linked Mg(II) species in fresh water systems is discussed.

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