MediumChemistryHigh School (11–12)Coordination CompoundsNumerical

The first stability constants for ethane-1,2-diamine are log K₁ = 2.7 for Mn²⁺ and log K₁ = 10.6…

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The first stability constants for ethane-1,2-diamine are $\log K_1 = 2.7$ for $\text{Mn}^{2+}$ and $\log K_1 = 10.6$ for $\text{Cu}^{2+}$ . Find the difference in $\log K_1$ , and $\Delta G^\circ$ for each ion at $298\ \text{K}$ .

Need a reminder? The key ideaShow

$\Delta_o \approx f \times g \times 1000\ \text{cm}^{-1}$ and $\lambda = 10^7/\tilde{\nu}$ in nm. A larger splitting gives a shorter wavelength. $\log\beta_n = \sum \log K$ and $\Delta G^\circ = -5.706 \times \log\beta$ kJ/mol at $298\ \text{K}$ .

The worked solution

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← Use g = 14.0 for Fe³⁺ and the ligand factors f: fluoride 0.90, water 1.00 and cyanide 1.70…Cadmium(II) adds ammonia in four steps with log K = 2.6, 2.1, 1.4 and 0.9… →

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