Which of the following strong electrolytes has the least negative hydration enthalpy?
A) NaCl
B) KCl
C) RbCl
D) CsCl
E) HCl

Question

Quizplus · Accepted Answer

As we move down the periodic table, the size of the cation increases, leading to a decrease in the charge density. This makes it easier for water molecules to surround the cation, resulting in a less negative hydration enthalpy. CsCl will have the largest cation and hence the least negative hydration enthalpy.

Which of the Following Strong Electrolytes Has the Least Negative