Physical Chemistry> Hydration Energy?...

Please explain the concept of hydration energy.

Aman Mittal , 15 Years ago

Grade 12

2 Answers

jauneet singh

Last Activity: 15 Years ago

aman

hydration energy is the energy require 2 solve the substance...........................hydration energy depend upon the size of the molecule.hydration energy is the -ive energy.it is released whem a substance is solved in the molecule.....................................it has an imp role in the soliubity of tjhe molecule......................

sol is directly prop 2 hydration energy,directly prop 2 ionic character,and inv prop 2 lattice energy.......................by using this concept u can decide soliubity of any compund

deeksha sharma

Last Activity: 14 Years ago

When a polar compound is dissolved in a polar solvent like water, which has high, dielectric constant,the compound dissociates into ions. The reason is that polar solvents interact with ions of crystals and further high dielectric constant, of the solvent cuts of the force of attaraction between these ions. The ions may conbine with the solvent to liberate energy. This energy is called HYDRATION ENERGY or ENTHALPY.

If you are still confused, then remember in short, when polar compound is dissolved in polar solvent(like water), it dissociates into ions. These ions combine with molecules of water and thus release energy. This energy is called hydration enthalpy.

e.g. when NaCl is dissolved in water......

NaCl breaks to Na⁺and Cl^-

H₂O exists as H₃O⁺and O^-2

Na⁺ attaches itself with O^-2 and Cl^- attaches with H₃O⁺

This leads to release in energy. The energy released is called HYDRATION ENTHALPY

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DEEKSHA