68. In the presence of NH 3, Cu+2 forms the complex ion Cu(NH3) 4+2. If the equilibrium concentrations of Cu+2 and Cu(NH3) 4+ are 1.8 x 10-17 M and 1.0 x 10-3 M, respectively, in a 1.5 M NH3 solution, calculate the value for the overall formation constant of Cu(NH3)+2. Cu+2 + 4 NH3 -> Cu(NH3) 4+2

Calculate the solubility (in moles per liter) of Fe(OH)3 (Ksp = 4 1038) in each of the following. a. water b. a solution buffered at pH = 5.0 c. a solution buffered at pH = 11.0

The solubility of cadmium oxalate. CdC2O4, in 0.150 M ammonia is 6.1 103 mol/L. What is the oxalate-ion concentration in the saturated solution? If the solubility product constant for cadmium oxalate is 1.5 108, what must be the cadmium-ion concentration in the solution? Now calculate the formation constant for the complex ion Cd(NH3)42+.

Ethylenediaminetetraacetate (EDTA4 ) is used as a complexing agent in chemical analysis with the structure shown in Fig. 21.7. Solutions of EDTA4 are used to treat heavy metal poisoning by removing the heavy metal in the form of a soluble complex ion. The complex ion virtually prevents the heavy metal ions from reacting with biochemical systems. The reaction of EDTA4 with Pb2+ is Pb2+(aq) + EDTA4(aq) iPbEDTA2(aq) K = 1.1 1018 Consider a solution with 0.010 mol of Pb(NO3)? added to 1.0 L of an aqueous solution buffered at pH = 13.00 and containing 0.050 M Na1EDTA. Does Pb(OH)2 precipitate from this solution? [Ksp for Pb(OH)2 = 1.2 1015.

Calculate the solubility of copper(II) iodate, Cu(IO3)2 (Ksp = 7.4 108), in (a) water. (b) a 0.10 M copper(II) nitrate solution.

What types of isomers are possible for the following compounds or complex ions? (a) K[Co(NH3)2Cl4] (b) Pt(en)Cl2 (square-planar) (c) [Co(NH3)5Cl]2+ (d) [Ru(phen)3]Cl3 (e) Na2[MnCl4] (tetrahedral) (f) [Co(NH3)5NO2)2+

How many geometric isomers are possible for the square-planar complex ion [Pt(NH3)(CN)Cl2)?

Which of the following statement(s) is( are) true? a. The coordination number of a metal ion in an octahedral complex ion is 8. b. All tetrahedral complex ions are low-spin. c. The formula for triaquatrianuninechromiwn(III) sulfate is [Cr(H2O)3(NH3)](SO4)3. d. The electron configuration of Hf2+ is [Xe]4f126s2. e. Hemoglobin contains Fe3+.

The transition metals form a class of compounds called metal carbonyls, an example of which is the tetrahedral complex Ni(CO)4. Given the following thermodynamic data (at 298 K): (a) Calculate the equilibrium constant for the formation of Ni(CO)4(g) from nickel metal and CO gas. (b) Is the reaction of Ni(s) and CO(g) product- or reactant-favored at equilibrium? (c) Is the reaction more or less product-favored at higher temperatures? How could this reaction be used in the purification of nickel metal?