Why does NaCl dissolve in water (in terms of entropy)?
Answer:
In the solid state, NaCl is tightly held in a crystalline structure of Na+ and Cl- ions. When it is dissolved in water, the Na and Cl ions become dissociated and free to move in the H+ and OH- ions of the water, thus forming a more disordered system and decreasing its entropy
in terms of entropy, NaCl dissolves because dissolved NaCl is at a more disordered state than crystalline NaCl and wherever possible systems tend towards disorder.
NaCl(s) ---> Na+(aq) + Cl-(aq)
The randomization of the ions of Na and Cl vs. the pure solid NaCl is an increase in entropy. In addition, the lowering of the purity of the water is an increase in the entropy.
We know that entropy is a measure of randomness, if randomness(or disorder) increases the reaction become feasible....
Now randomness is more in liquid state(or in aquoeus form) than the solid state.
Thats why NACl (solid) dissolves in water to produce ions which have more disorder or randomness.
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