Here are the definitions I use.
Ionization is the conversion of a neutral molecule or atom to an ion.
Thus, the conversion of an ##”Na”## atom to ##”Na”^+## is an ionization.
When ##”HCl”## gas dissolves in water, it reacts to form separate ##”H”_3″O”^+## and ##”Cl”^”-“## ions.
##”HCl(g)” + “H”_2″O(l)” → “H”_3″O”^+”(aq)” + “Cl”^”-“”(aq)”##
This is also a dissociation process.
Dissociation is a process in which a compound separates into two or more parts.
For example, water dissociates into hydronium and hydroxide ions.
When ##”NaCl”## dissolves in water, it forms separate ##”Na”^+## and ##”Cl”^”-“## ions. This is a dissociation process.
##”NaCl(s)” → “Na”^”+””(aq)” + “Cl”^”-“”(aq)”##
Here’s a great video that shows how water dissolves salt.
##”N”_2″O”_4## decomposes into two ##”NO”_2## molecules. This is a dissociation process.
##”O”_2″N-NO”_2 → “2NO”_2##
Dissolution is the process in which the particles of a substance move into the solvent.
The process may not involve dissociation, as in the dissolving of sugar …
(from antoine.frostburg.edu)
… or it may, as in the case of sodium chloride.
Sugar does not dissociate in water, but ##”NaCl”## does dissociate into ions when it dissolves.
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