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What is the factor that is responsible for salts like NaCl to dissolve in water easily?

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What is the factor that is responsible for salts like NaCl to dissolve in water easily?

(a) Decrease in entropy

(b) Increase in entropy

(c) Increase in enthalpy

(d) Decrease in enthalpy

The question was posed to me in quiz.

My question is based upon Weak Interactions in Aqueous Systems topic in portion Water Basics of Biochemistry

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Right choice is (b) Increase in entropy

Easy explanation: As a salt such as NaCl dissolves, the Na^+ and Cl^– ions leaves the crystal lattice resulting in an increase in entropy(randomness) of the system which is largely responsible for the ease of dissolving salts such as NaCl in water.

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