Concept explainers
Many aqueous solutions of complex ions display brilliant colors that depend on the identities of the metal ion and ligand(s). Some ligands bind selectively to certain metal ions and produce a complex ion with characteristic colors. These distinctive complex ions serve as qualitative indicators of the presence of particular metal ions. For example, Fe3+is identified by the rapid formation of the intensely colored pentaaquathiocyanatoiron(III) complex ion. [Fe(H2O)5SCN]2+, when thiocyanate, SCN-,is added to a solution containing hexaaquairon(III), [Fe(H2O)6]3+, according to the balanced chemical equation shown here:
Examine the absorption spectrum of an aqueous solution of [Fe(H2O)5SCN]2+ shown here and answer the questions.
Absorption spectrum of [Fe(H2O)5SCN]2+
- Based on the spectrum, what is the color of an [Fe(H2O)5SCN]2+ solution?
[Fe(H2O)6]3+, Produces a pale violet aqueous solution. Is the crystal field splitting energy, Δ, of [Fe(H2O)6]3+ smaller or larger than the Δ of [Fe(H2O)5SCN]2+?
[Fe(CN)6]3-, is red in aqueous solution. What can you conclude about the relative crystal field splitting energies of [Fe(CN)6]3- and [Fe(H2O)5SCN]2+?
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Chapter 22 Solutions
MASTERING CHEMISTY NVCC ACCESS CODE
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