Question

Predict the sign of entropy change in "crystallization of copper sulphate from its saturated solution".

Answer 1

Entropy is a measurement of the lack of thermal energy of any mechanical work system. It also represents the system's randomness. As randomness increases the system entropy. Entropy of the system is directly proportional to the randomness.

Let's predict the sign of entropy change in crystallization of copper sulphate from its saturated solution.

Copper sulphate crystals have ordered arrangement whereas ions in sol have greater randomness.

Therefore, ΔS $\quad is\quad -ve.$