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Althrough dissolution of NH(4)CI in wate...

Althrough dissolution of `NH_(4)CI` in water is endothermic yet is dissolved. Why?

Text Solution

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This is because of entropy change. In this case, `DeltaS` is positive.
`NH_(4)Cl (aq) rarr NH_(4)^ (o+) (aq) + Cl^(ө) (aq)`
The ions that were held together in the crystalline solid are free and move in all possible directions. Its entropy increases and then `T DeltaS gt DeltaH`.
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