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For a salt to disoolve in water , its hydration enthalpy shud be greater than its lattice enthalpy But what if hydration enthalpy is equal to lattice enthalpy?? Will the salt dissolve or not??

For a salt to disoolve in water , its hydration enthalpy shud be greater than its lattice enthalpy But what if hydration enthalpy is equal to lattice enthalpy?? Will the salt dissolve or not??

Grade:11

1 Answers

Aman Bansal
592 Points
12 years ago

Dear Ranjita,

(i) ionic compound(s) + aq (c) doc b cations(aq)  +  anions(aq)
(ii) solid ionic compound vapourised to give gaseous ions - this ΔH is called the LATTICE ENTHALPY (c) doc b

(endothermic)

 

 

gaseous cations and anions

(exothermic)

 (iii) hydration of the cations and anions - theseΔHs are called the ENTHALPY of HYDRATION of the ION
In terms of enthalpy changes: (i) = (ii) + (iii)

Enthalpy of solution ΔHsolution(compound) is defined as the heat absorbed or released when 1 mole of compound dissolves in water

Lattice enthalpy ΔHLE(compound) is defined as the energy released when 1 mole of a solid is formed from its separated gaseous ions

Enthalpy of hydration is defined as the energy released when 1 mole of gaseous ions interacts with water to give a solution of the hydrated ions

All three enthalpy terms are re-defined in more detail and explained in further detail as  the discussion proceeds.

 

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