What distinguishes ionization dissociation and dissolution?

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    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_3O^+## and ##Cl^-## ions.
    ##HCl(g) + H_2O(l) H_3O^+(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_2O_4## decomposes into two ##NO_2## molecules. This is a dissociation process.
    ##O_2N-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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