BRAINCAKEEnthalpy Change of Solution
When a solid dissolves the ionic lattice breaks down or dissociates (endothermic) and the ions become hydrated (exothermic). The resulting enthalpy change is called the enthalpy of solution. The energy needed to break down the lattice is the lattice dissociation enthalpy. This has the same magnitude as the lattice enthalpy but has the opposite sign.
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More in Lattice Enthalpy
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All 10 lessons in Lattice Enthalpy · All Edexcel A-level Chemistry topics