04. Relationship between enthalpy changes in soution hydroogen and lattice breaking
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9 Terms
What does water do to many ionic substances?
Dissolves them
Why does water dissolve many ionic substances?
Water is polar, and water molecules break the giant ionic lattice and surround each ion
Write an equation showing NaCl dissolving in water. What does this represent also?
NaCl(s) -> Na+(aq) + Cl-(aq)
Enthalpy change of solution
What shows if something is more soluble
Enthalpy change of solution is more negative
What does enthalpy change of solution being more negative show?
It’s more soluble
Can you show the energy cycle of NaCl
Yes
What has to happen for an ionic solid to dissolve exothermically in water
Energy absorbed to break lattice into gaseous ions must be less than energy evolved in hydrating ions
How do you know if ionic solid is soluble?
Sum of hydration energies of ions > lattice energy (enthalpy change of solution more negative)
How do you know if ionic solid is less soluble?
Sum of hydration energies of ions < lattice energy (enthalpy change of solution more positive)