Enthalpy of solution/hydration

Question 1

What happens when an ionic salt is dissolved in water?

Answer 1

When an ionic salt is dissolved in water, the ionic lattice or lattice breaks up into ions.

These ions interact with the polar water molecules to form hydrated ions , which are held together by ion-dipole or ion dipole forces.

Question 2

Define enthalpy change of solution

Answer 2

The enthalpy change when 1 mole of a solute, in its standard state, dissolves in water to form aqueous ions.

Question 3

What is the equation for the enthalpy change of solution for potassium iodide?

Answer 3

KI (s) -> K+ (aq) + I- (aq)

Question 4

Breaking apart an ionic lattice is what kind of process?

Answer 4

endothermic

Question 5

The ion-dipole attraction between ions and polar water molecules is what kind of process?

Answer 5

exothermic

Question 6

Ionic salts can have which kind of enthalpy of solution?

Answer 6

endothermic or exothermic

Question 7

Define lattice enthalpy

Answer 7

The enthalpy change when one mole of an ionic lattice is formed from its gaseous ions under standard conditions

Question 8

How would you measure enthalpy change of solution?

Answer 8

q=mcΔT