The lattice energy of solid NaCl is . The dissolution of the solid in water in the form of ions is endothermic to the extent of
. If the hydration energies of
and
are in the ratio 5 : 4, what is the enthalpy of hydration of the ion?
The lattice enthalpy and the enthalpy change for hydration are added to determine the enthalpy change for dissolution.
Substitute values in the above expression,
The sum of the enthalpies of hydration for sodium ions and chloride ions is the enthalpy of hydration for sodium chloride.
The hydration energies of sodium ions and chloride ions are in the ratio 5: 4.
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