Niobium

Original source: Filella, M., May, P.M., 2020. The aqueous solution thermodynamics of niobium under conditions of environmental and biological interest. Applied Geochemistry 122, 104729.

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

Reaction	log K
Nb(OH)₅(am.,s) = Nb(OH)₅⁰	–7.510
Nb₂O₅(s) + 5 H₂O = 2 Nb(OH)₅⁰	–18.31
Nb(OH)₅⁰ + H⁺ = Nb(OH)₄⁺ + H₂O	1.603
Nb(OH)₅⁰ + H₂O = Nb(OH)₆^– + H⁺	–4.951
Nb₆O₁₉^8– + H⁺ = HNb₆O₁₉^7–	14.95
HNb₆O₁₉^7– + H⁺ = H₂Nb₆O₁₉^6–	13.23
H₂Nb₆O₁₉^6– + H⁺ = H₃Nb₆O₁₉^5–	11.73
HNa₇Nb₆O₁₉ ·5H₂O(s) = 7 Na⁺ + HNb₆O₁₉	11.85

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