Question

When will a salt become less soluble in water?

Answer 1

Salt is less soluble when the temperature decreases.  Salt would dissolve quicker in hot water than cold because the molecules in hot water move faster than cold water because of the higher energy, therefore the molecules of hot water move fast, they can more easily break apart the other molecules of a different substance when they come in contact.

Answer 2

I'll be less soluble when the temperature increases