Lattice Enthalpy

Question 0

Definition of enthalpy change of solution

Answer 0

The enthalpy change that takes place when one mole of a compound is completely dissed in water under standard conditions.

Question 1

What is lattice enthalpy?

Answer 1

A measure of ionic bond strength

Question 2

Definition of enthalpy change of hydration

Answer 2

The enthalpy change that takes place when one mole of isolated gaseous ions is dissolved in water forming one mole of aqueous ions under standard conditions

Question 3

What is the effect of ionic charge on the exothermic value of lattice enthalpy?

Answer 3

Higher ionic charge means more attraction between ions and lattice enthalpy becomes MORE exothermic

Question 4

What is the effect of ionic size on the exothermic value of lattice enthalpy?

Answer 4

as ionic radius increases, attraction between ions decreases, lattice s finally becomes less exothermic (less negative)

Question 5

What is the effect of ionic charge on the exothermic value of enthalpy change of hydration?

Answer 5

Increased charge means greater attraction for water molecules, so enthalpy is more exothermic (more negative)

Question 6

What is the effect of ionic size on the exothermic value of enthalpy change of hydration?

Answer 6

Larger ionic radius, less exothermic (less negative), small ions exert more attraction in water merciless and more energy is released.