91Ó°ÊÓ

What is the value of \(\Delta\) (in \(\mathrm{kJ} / \mathrm{mol}\) ) when \(\lambda=680 \mathrm{~nm}\), corresponding to an electron jump between \(d\) -orbital levels in a complex with \(d^{1}\) configuration?

The hexaaquascandium(III) ion, \(\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}^{3+}\), is colorless. Explain why this might be expected.

The tetraaquazinc(II) ion, \(\mathrm{Zn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}^{2+}\), is colorless. Explain why this might be expected.

There are only two geometric isomers of the triamminetrichloroplatinum(IV) ion, \(\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{4}^{+}\). How many geometric isomers would be expected for this ion if it had a regular planar hexagonal geometry? Give drawings for them. Does this rule out a planar hexagonal geometry for \(\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{4}^{+} ?\) Explain.

Find the concentrations of \(\mathrm{Cu}^{2+}(a q), \mathrm{NH}_{3}(a q)\), and \(\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}^{2+}(a q)\) at equilibrium when \(0.10 \mathrm{~mol} \mathrm{Cu}^{2+}(a q)\) and \(0.40 \mathrm{~mol} \mathrm{NH}_{3}(a q)\) are made up to \(1.00 \mathrm{~L}\) of solution. The dissociation constant, \(K_{d}\), for the complex \(\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}^{2+}\) is \(2.1 \times 10^{-13}\)

Find the concentrations of \(\mathrm{Ag}^{+}(a q), \mathrm{NH}_{3}(a q)\), and \(\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}^{+}(a q)\) at equilibrium when \(0.10 \mathrm{~mol} \mathrm{Ag}^{+}(a q)\) and \(0.10 \mathrm{~mol} \mathrm{NH}_{3}(a q)\) are made up to \(1.00 \mathrm{~L}\) of solution. The dissociation constant, \(K_{d}\), for the complex \(\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}^{+}\) is \(5.9 \times 10^{-8}\)