Inorganic Chemistry Answers

Is the room temperature structure of BaTiO3 centrosymmetric or noncentrosymmetric? Explain.

The two acid ionization constants for oxalic acid, HOOCCOOH, are Ka1=5.6x10^-2 and Ka2=1.5x10^-4. What is the base dissociation constant, Kb, for OOCCOO2-(aq)?

Jarosite-type KFe3(SO4)2(OH)6 has a hexagonal crystal structure containing 2-D networks of corner-connected FeO6 octahedra in the a-b plane, stacked and separated from one another along the c-axis.

This compound adopts a complex long-range-ordered antiferromagnetic state below 46 K. However, a fit of the Curie-Weiss law to the linear region of the inverse magnetic susceptibility yields a Weiss temperature (θ) of -600 K. Explain the discrepancy between these two values in terms of the crystal structure and magnetic exchange interactions

The values of lattice energies (kJ/mol) for NaCl and AgCl are given below as calculated from

Born-Haber Cycle and Born-Lande equation, respectively.

U(B-H) U(B-L)

NaCl 787 751

AgCl 915 734

a) Why is the value for the lattice energy in each case, greater from Born-Haber cycle than that

from the Born-Lande equation?

b) What is the percentage difference between the two values for NaCl and AgCl? Rationalize

this on the basis of the difference in electronegativities of Na:Cl and Ag:Cl.

The common oxidation number for an alkaline earth metal is +2. Using the Born–Mayer equation and a Born–Haber cycle, show that CaCl is an exothermic compound. Use a suitable analogy to estimate an ionic radius for Ca+. The sublimation enthalpy of Ca(s) is 176 kJmol-1. Show that an explanation for the nonexistence of CaCl can be found in the enthalpy change for

the reaction 2 CaCl(s) → Ca(s) + CaCl2(s).

GeO2 exists in a number of structures, most commonly a hexagonal form that is built on corner sharing GeO4 tetrahedra and a tetragonal structure in the mineral argutite built from edge sharing GeO6 octahedra.

Giving your reasoning predict if a direct transformation between the hexagonal and tetragonal structures is likely to be first order or continuous.

How many grams of ammonium chloride must be added to 0.050 kg of water to produce a

solution that freezes at -5.00 °C? The cryoscopic constant of water is 1.86 °C kg mol-1 The

molar mass of ammonium chloride is 53.5 g mol-1.

The partition coefficient of a base B (monoacidic) at a particular pH, in an octanol-water mixture

is 1.45. Consider an experiment where 3.5 g of B are shaken with 100 mL of octanol and 50 mL

of water.

Molar mass of B = 101.19 g mol-1

(i) Calculate the mass of B in the aqueous layer after shaking.

The partition coefficient of a base B (monoacidic) at a particular pH, in an octanol-water mixture

is 1.45. Consider an experiment where 3.5 g of B are shaken with 100 mL of octanol and 50 mL

of water.

Molar mass of B = 101.19 g mol-1

(i) Calculate the mass of B in the aqueous layer after shaking.

Show by means of energy orbital diagrams how sodium hexachlorovanadate(II) exists as a magnetic transition metal compound whereas tris(ethylenediammine)nickel(IV) nitrate is unaffected by a magnetic field. (c) 53.8 grams of a complex, diamminebis(oxalato)cobaltate(II), were dissolved in water and its ligand field splitting energy was measured as 55.0 kJ. What is the color of the complex? Ac: Co = 59; N = 14; H = 1; C = 12; 0 = 16