Enthalpies Of Solution And Hydration

Question 1

What can enthalpy of solution and hydration be used to measure

Answer 1

Lattice enthalpy indirectly by using similar idea to Hess’s law

Question 2

What is enthalpy of solution and is it exo or endo

Answer 2

Enthalpy change when one mole of ionic solid dissolved in water, can be endo or exo

Question 3

What is enthalpy of hydration and is it exo or endo and why

Answer 3

Enthalpy change when one mole of gaseous ions is dissolved in water, always exo as water molecules have delta positive regions that naturally attract negative ions, form bonds

Question 4

How to construct energy cycle using enthalpy of solution and hydration to calculate lattice enthalpy

Answer 4

Na+(g) + Cl-(g) —-(LE)—->NaCl(s)—-(enthalpy change of solution)—> Na+(aq) + Cl-(aq) and arrow from gaseous ions to aqueous ions which is enthalpy change of hydration

Question 5

Equation for lattice enthalpy of sodium chloride

Answer 5

Na+(g) + Cl-(g) ——> NaCl(s)

Question 6

Equation for enthalpy of solution of sodium chloride

Answer 6

NaCl(s) + (aq)——> Na+(aq) + Cl-(aq)

Question 7

Equation for enthalpy of hydration for sodium and chlorine

Answer 7

Na+(g) + Cl-(g) ——> Na+(aq) + Cl-(aq)

Question 8

When is hydration enthalpy more exo

Answer 8

When attractions stronger so smaller ions with greater charge

Question 9

When is lattice dissociation enthalpy more exo

Answer 9

When smaller ionic radius and higher charge as attractions stronger so more energy released when these ionic bonds form