For formation constants measured at the same temperature, use ΔG° = −RT lnβ and the data log₁₀β: [M(NH₃)₆]²⁺ = 8, [M(en)₃]²⁺ = 15, [M(EDTA)]²⁻ = 19. All are overall formation constants from free M²⁺ a

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For formation constants measured at the same temperature, use ΔG° = −RT lnβ and the data log₁₀β: [M(NH₃)₆]²⁺ = 8, [M(en)₃]²⁺ = 15, [M(EDTA)]²⁻ = 19. All are overall formation constants from free M²⁺ and the stated free ligands. Which comparisons are correct?

TestHub · Accepted Answer

Larger logβ gives larger β and more negative ΔG°. Thus EDTA > en > ammine by the stated formation constants; the ratio is 10⁽¹⁹⁻¹⁵⁾ = 10⁴. β for the ammine is 10⁸, not 10⁻⁸. Different reaction stoichiometries mean these comparisons are standard-state statements, not a universal prediction at arbitrary concentrations.

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