22.2 Enthalpy changes in solution

Question 1

what happens when a salt dissolves in water?

Answer 1

the giant ionic lattice is broken up and the ionic bonds are overcome

Question 2

what is the standard enthalpy of solution?

Answer 2

energy change when one mole of a solute is dissolved in a solvent (solid to aqueous)

Question 3

how does water dissolve solutes?

Answer 3

its polar so its delta negative oxygen attracts positive ions while its delta positive hydrogen attracts negative ions

Question 4

what is the bonding in NaCl (s)?

Answer 4

giant ionic lattice with strong ionic bonds

Question 5

what is the bonding in NaCl (aq)?

Answer 5

ionic are separate but now surrounded by water molecules

Question 6

what mass should you use in solution calculations?

Answer 6

the mass of the water + solute

because the solute is dissolved in the water so is also being heated up

Question 7

what happens to a solid ionic compound when dissolved in water?

Answer 7

the ionic lattice breaks up

water molecules are attracted to the ions

Question 8

what is the enthalpy change of hydration?

Answer 8

energy change when one mole of gaseous ions are dissolved in water to form one mole of aqueous ions
(gas to aqueous)

Question 9

diagram for an ionic compound dissolving in water

Answer 9