Danyal124
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Help!!!!! Could someone explain the question in green I can’t see how it’s a two step proceeds to dissociate a lattice means to break it but I don’t understand the steps below
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studyAngelx
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(Original post by Danyal124)
Help!!!!! Could someone explain the question in green I can’t see how it’s a two step proceeds to dissociate a lattice means to break it but I don’t understand the steps below
Basically The enthalpy change of solution is the enthalpy change when 1 mole of an ionic substance dissolves in water to give a solution

the enthalpy of hydration is the enthalpy when one mole of gaseous ions are converted to one mole of aqueous ions.

In order to produce the enthalpy of solution, the ionic lattice is broken to gaseous ions, then the ions are surrounded by water molecules to form aqueous ions (hydration).

First, the lattice dissociation enthalpy has to be put in to break the lattice and form the gaseous ions, (one Ca2+ and two Cl-),

then the enthalpy of hydration is put in for each ion, which is to have water molecules completely surround each ion to form aqueous ions.

This combination of the lattice enthalpy of dissociation and hydration forms the enthalpy of solution.
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