examstudy
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if standard enthalpy change of solution = - lattice enthalpy
How can standard enthalpy change of solution be exothermic and endothermic?
Lattice enthalpy is always exothermic and therefore standard enthalpy change of solution much be endothermic
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BobbJo
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enthalpy change of solution = -lattice energy + hydration enthalpy

hence enthalpy of solution can be both exo or endothermic.
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examstudy
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(Original post by BobbJo)
enthalpy change of solution = -lattice energy + hydration enthalpy

hence enthalpy of solution can be both exo or endothermic.
Ok my textbook says:
"therefore the enthalpy change of ionic lattice breakdoown is equal to - lattice energy"
is it wrong?
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examstudy
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(Original post by BobbJo)
that's correct. -lattice energy represents the energy for the ionic lattice to break down.

the ions will then be hydrated. the accompanying energy change is the enthalpy change of hydration

hence the net enthalpy change, enthalpy change of solution, is equal to -lattice energy + hydration enthalpy
thank you
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