254 Chapter 7. Entropic forces at work[[Student version, January 17, 2003]]
The translational entropy change for a molecule to enter water is always positive, since then the
molecule explores a greater volume. If the entropy change of the water itself were also positive, then
every term of ∆Fwould favor solvation, and we could dissolve any amount of solute. Since that’s
not the case, these solutes must induce a negative entropy change in the water upon solvation.