To dissolve an ionic compound, the water molecule must have the ability to stabilize the ion that an outcome from break the ionic bond.

You are watching: What happens when an ionic compound dissolves in water

They execute this through hydrating the ions.

Water is a polar molecule. It has actually a permanent dipole.

The #"O"# atom has a partial an adverse charge, and the #"H"# atoms have actually a partial optimistic charge.

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When you place an ionic problem in water, the water molecules lure the optimistic and an adverse ions from the crystal.

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The particles space then totally free to move roughly within the solution.

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(from 2012books.lardbucket.org)

The hopeful ions have several water molecules around them, all with their #"O"# atom close to the positive ion.

The an unfavorable ions have several water molecules approximately them, all through their #"H"# atom close come the an adverse ion.

The "shell" that water molecules reduces the attractions between the ions. The ions space hydrated.

Here"s a video that shows the process in action.


Answer link
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R-Rahaman Raza
Nov 29, 2015

Ionic link dissolve in water as result of the difference between its lattice energy and also its hydration energy.


An ionic compound consists of 2 oppositely fee ions. Water, meanwhile is a polar solvent; the electronegativity difference between oxygen and also hydrogen is high i beg your pardon is why water has actually a hopeful pole the #H# and also a negative pole #O# (water is #H_2O#).

What happens is, once an ionic compound is put in water, the negative ion, or the anion, attracts the hopeful #H# pole around it, and also the confident ion, or the cation, attracts the an adverse #O# pole around it. This outcomes in the development of a unique arrangement called the hydration.

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Hydration publication energy, i beg your pardon is known as the hydration energy. Every ionic compound has an power holding the lattice structure of the compound, recognized as lattice energy. If the hydration energy of an ionic compound exceeds the lattice energy, the lattice is broken and the ion in the compound separate, leading to the link to dissolve. If the hydration energy of the link is lesser than the lattice energy, the compound will not dissolve.