INO-21

Complex formation Kf

Kf = [ML] / ([M][L]). One-step formation snapshot.

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CoordinationFormation constant

Governing equation

K_f=\dfrac{[ML]}{[M][L]}

where

[ML]: Complex (mol/L)
[M]: Free metal (mol/L)
[L]: Free ligand (mol/L)
K_f: Formation constant (L/mol)

Lecture brief

Historical brief

Pauling and Allred–Rochow electronegativity, Kapustinskii lattice energy, CFSE and Goldschmidt radii organise the periodic solid. The sheets predict bond character and crystal packing. This sheet (INO-21 — Complex formation Kf) is the form associated with Formation constant. Working symbols: $[ML]$ , $[M]$ , $[L]$ $\rightarrow$ $K_f$ . Overall βn = K1 K2 … Kn. Large Kf means a sequestered metal.

Purpose

Purpose: compute

K_f

from

[ML]

[M]

[L]

in Inorganic chemistry via

K_f=\dfrac{[ML]}{[M][L]}

Kf = [ML] / ([M][L]). One-step formation snapshot. Use it when a real inorganic chemistry question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given

[ML] = 0.009\,\mathrm{mol/L}

[M] = 0.001\,\mathrm{mol/L}

[L] = 0.001\,\mathrm{mol/L}

, the governing relation

K_f=\dfrac{[ML]}{[M][L]}

yields

K_f = 9000.000\,\mathrm{L/mol}

. 1:1 complex, dilute, no competing ligands. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Complex [ML]0.009 mol/LFree metal [M]0.001 mol/LFree ligand [L]0.001 mol/L

Outputs

Formation constant K_f9000.000 L/mol

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Narration of this film

1:1 complex, dilute, no competing ligands.

Overall βn = K1 K2 … Kn. Large Kf means a sequestered metal.

Reading speed

Watch on YouTube