Question

My quastion is below, can you please explain why ? thank you.

True or false:

The hydration process of a soluble ionic compound always decreases the entropy of water.

Answer 1

Entropy is the degree of randomness in a substance. Higher the randomness more will be entropy. Hydration is the process of interaction between the water molecules and the solute particles.This interaction is called ion- dipole interaction.

When a soluble ionic compound dissolved in water, the water molecules surround the cataion of the ionic solid to form a sphere. More the sphere formed more will be collision. As a result the randomness will increase.so the entropy will increase.

Hence the statement is false.