Germanium

Original source: Filella, M., May, P.M., 2023. The aqueous solution chemistry of germanium under conditions of environmental and biological interest: Inorganic ligands. Applied Geochemistry, proofs available.

Best stability constant values for germanium species, 25 °C and I 0 mol L^-1:

Reaction	log K
Ge(OH)₄ + 2 e^- = Ge²⁺ + 4H₂O	-7.206
GeO₂(OH)₂^2– + H⁺ = GeO(OH)₃^–	12.76
GeO(OH)₃^– + H⁺ = Ge(OH)₄	9.099
8 Ge(OH)₄ + 3 OH^- = Ge₈(OH)₃₅^3-	28.33
GeO₂(hexag,s) + 2 H₂O = Ge(OH)₄	–1.373
GeO₂(tetra,s) + 2 H₂O = Ge(OH)₄	–4.999
Ge(OH)₄ + 4 H⁺ + 6 F^- = GeF₆^2- + 4 H₂O	27.98
Ge(OH)₄ + 5 H⁺ + 6 F^- = GeHF₆^- + 4 H₂O	28.80
Ge(OH)₄ + 4 H⁺ + 4 F^- = GeF₄ + 4 H₂O	20.14
Ge(OH)₄ + 3 H⁺ + 4 F^- = GeF₄(OH)^- + 3 H₂O	19.08
Ge(OH)₄ + 3 H⁺ + 2 F^- = GeF₂(OH)^- + 3 H₂O	9.345

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