Entropy of Ionic Substances

• Ionic Solids : Entropy depends on extent of motion of ions. This depends on the strength of coulombic attraction.

• Entropy increases when a pure liquid or solid dissolves in a solvent.

NH4NO3(s) ? NH4+ (aq) + NO3- (aq)

?Ssol =

So(aq. ions) - So(s) = 259.8 - 151.1

= 108.7 J.K-1mol-1

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