The two hypothetical ionic compounds A B 2 and CB 2 having almost same lattice energies are very soluble and slightly soluble in water respectively. The difference in solubility between these two compounds has to be explained. Concept Introduction: The energy released when gaseous state ions of unlike charges that are infinitely farther apart combine to form a stable ionic solid is called Lattice energy . Conversely, the energy required to break the electrostatic force of attraction between the ions of unlike charges in the ionic solid and revert them to gaseous state is also termed as Lattice energy of an ionic solid. Hydration energy refers to the quantity of energy released when one mole of ion gets hydrated at constant pressure. Hydration energy of an ion depends upon its ionic size. Solubility of an ionic compound is primarily influenced by two factors – lattice energy and hydration energy.

Question

3. Maximum solubility of an ionic compounds in water depend on different sets of conditions. Out of five sets of conditions (given below), which one is the best for getting maximum solubility? A. The magnitude of the lattice energy should be large, and the enthalpy of hydration of the ions should be large. B. The enthalpy of hydration (Delta H) of the cation should be equal to the enthalpy of hydration of the anion, regardless of the magnitude of the lattice energy C. The magnitude of the lattice energy should be small, and the enthalpy of hydration of the ions should be small. D. The magnitude of the lattice energy should be small, and the enthalpy of hydration of the ions should be large. E. The magnitude of the lattice energy should be large, and the enthalpy of hydration of the ions should be small.

Answer 1

Question

Chapter 12.2, Problem 12.3CC

Interpretation Introduction

Interpretation:

The two hypothetical ionic compounds AB2 and CB2 having almost same lattice energies are very soluble and slightly soluble in water respectively. The difference in solubility between these two compounds has to be explained.

Concept Introduction:

The energy released when gaseous state ions of unlike charges that are infinitely farther apart combine to form a stable ionic solid is called Lattice energy. Conversely, the energy required to break the electrostatic force of attraction between the ions of unlike charges in the ionic solid and revert them to gaseous state is also termed as Lattice energy of an ionic solid.

Hydration energy refers to the quantity of energy released when one mole of ion gets hydrated at constant pressure. Hydration energy of an ion depends upon its ionic size.

Solubility of an ionic compound is primarily influenced by two factors – lattice energy and hydration energy.

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3. Maximum solubility of an ionic compounds in water depend on different sets of conditions. Out of five sets of conditions (given below), which one is the best for getting maximum solubility? A. The magnitude of the lattice energy should be large, and the enthalpy of hydration of the ions should be large. B. The enthalpy of hydration (Delta H) of the cation should be equal to the enthalpy of hydration of the anion, regardless of the magnitude of the lattice energy C. The magnitude of the lattice energy should be small, and the enthalpy of hydration of the ions should be small. D. The magnitude of the lattice energy should be small, and the enthalpy of hydration of the ions should be large. E. The magnitude of the lattice energy should be large, and the enthalpy of hydration of the ions should be small.

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